Hello. Here is the patch to allow different mmap filtering. It naturally
incorporates badram and also intercepts int12/15 so it works also with
OS recieving mmap from BIOS. It's useful for intercepting any bios
interrupts
--
Regards
Vladimir 'phcoder' Serbinenko
diff --git a/ChangeLog b/ChangeLog
index a6dd8f7..ce0eb8d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,52 @@
+2009-04-11 Vladimir Serbinenko <phco...@gmail.com>
+
+ Mmap services
+
+ * commands/lsmmap.c (grub_cmd_lsmmap): use grub_mmap_iterate
+ * loader/i386/linux.c (find_mmap_size): likewise
+ (allocate_pages): likewise
+ * loader/i386/multiboot.c (grub_get_multiboot_mmap_len): likewise
+ (grub_fill_multiboot_mmap): likewise
+ (grub_multiboot): use grub_mmap_get_lower and grub_mmap_get_upper
+ * loader/i386/pc/linux.c (grub_cmd_linux): use grub_mmap_get_lower
+ * include/grub/i386/bsd.h (OPENBSD_MMAP_AVAILABLE): new definition
+ (OPENBSD_MMAP_RESERVED): likewise
+ * include/grub/i386/pc/memory.h: include grub/memory.h
+ (grub_lower_mem): removed
+ (grub_upper_mem): likewise
+ (GRUB_MACHINE_MEMORY_ACPI): new definition
+ (GRUB_MACHINE_MEMORY_NVS): likewise
+ (GRUB_MACHINE_MEMORY_MAX_TYPE): likewise
+ (GRUB_MACHINE_MEMORY_HOLE): likewise
+ (grub_machine_mmap_register): likewise
+ (grub_machine_mmap_unregister): likewise
+ (grub_machine_get_upper): likewise
+ (grub_machine_get_lower): likewise
+ (grub_machine_get_post64): likewise
+ * conf/i386-pc.rmk (pkglib_MODULES): added mmap.mod
+ (mmap_mod_SOURCES): new variable
+ (mmap_mod_LDFLAGS): likewise
+ (mmap_mod_ASFLAGS): likewise
+ * conf/i386-coreboot.rmk: likewise
+ * conf/i386-ieee1275.rmk: likewise
+ * include/grub/types.h (UINT_TO_PTR): new macro
+ (PTR_TO_UINT32): likewise
+ (PTR_TO_UINT64): likewise
+ * include/grub/memory.h: new file
+ * mmap/i386/pc/mmap.c: likewise
+ * mmap/i386/pc/mmap_helper.S: likewise
+ * mmap/i386/uppermem.c: likewise
+ * mmap/mmap.c: likewise
+ * kern/i386/coreboot/init.c (grub_machine_init): don't use
+ grub_upper_mem
+ * kern/i386/pc/init.c (grub_lower_mem): removed variable
+ (grub_upper_mem): likewise
+ (grub_machine_init): don't use grub_upper_mem,
+ make grub_lower_mem local
+ * loader/i386/bsd.c (grub_openbsd_boot): use grub_mmap_get_lower,
+ grub_mmap_iterate and grub_mmap_get_upper
+ (grub_netbsd_boot): use grub_mmap_get_lower and grub_mmap_get_upper
+
2009-04-06 Vladimir Serbinenko <phco...@gmail.com>
Preboot hooks support
diff --git a/conf/i386-coreboot.rmk b/conf/i386-coreboot.rmk
index bc500d9..554463f 100644
--- a/conf/i386-coreboot.rmk
+++ b/conf/i386-coreboot.rmk
@@ -102,7 +102,13 @@ pkglib_MODULES = linux.mod normal.mod multiboot.mod \
aout.mod play.mod serial.mod ata.mod \
memdisk.mod pci.mod lspci.mod reboot.mod \
halt.mod datetime.mod date.mod datehook.mod \
- lsmmap.mod
+ lsmmap.mod mmap.mod
+
+# For mmap.mod.
+mmap_mod_SOURCES = mmap/mmap.c mmap/i386/uppermem.c
+mmap_mod_CFLAGS = $(COMMON_CFLAGS)
+mmap_mod_LDFLAGS = $(COMMON_LDFLAGS)
+mmap_mod_ASFLAGS = $(COMMON_ASFLAGS)
# For linux.mod.
linux_mod_SOURCES = loader/i386/linux.c
diff --git a/conf/i386-ieee1275.rmk b/conf/i386-ieee1275.rmk
index bbd6c09..9c0e4bc 100644
--- a/conf/i386-ieee1275.rmk
+++ b/conf/i386-ieee1275.rmk
@@ -103,7 +103,13 @@ grub_install_SOURCES = util/ieee1275/grub-install.in
pkglib_MODULES = normal.mod halt.mod reboot.mod suspend.mod \
multiboot.mod aout.mod serial.mod linux.mod \
nand.mod memdisk.mod pci.mod lspci.mod datetime.mod \
- date.mod datehook.mod lsmmap.mod
+ date.mod datehook.mod lsmmap.mod mmap.mod
+
+# For mmap.mod.
+mmap_mod_SOURCES = mmap/mmap.c mmap/i386/uppermem.c
+mmap_mod_CFLAGS = $(COMMON_CFLAGS)
+mmap_mod_LDFLAGS = $(COMMON_LDFLAGS)
+mmap_mod_ASFLAGS = $(COMMON_ASFLAGS)
#
# Only arch dependant part of normal.mod will be here. Common part for
diff --git a/conf/i386-pc.rmk b/conf/i386-pc.rmk
index fdb43df..178974c 100644
--- a/conf/i386-pc.rmk
+++ b/conf/i386-pc.rmk
@@ -175,7 +175,15 @@ pkglib_MODULES = biosdisk.mod chain.mod normal.mod \
ata.mod vga.mod memdisk.mod pci.mod lspci.mod \
aout.mod bsd.mod pxe.mod pxecmd.mod datetime.mod date.mod \
datehook.mod lsmmap.mod ata_pthru.mod hdparm.mod \
- usb.mod uhci.mod ohci.mod usbtest.mod usbms.mod usb_keyboard.mod
+ usb.mod uhci.mod ohci.mod usbtest.mod usbms.mod usb_keyboard.mod \
+ mmap.mod
+
+# For mmap.mod.
+mmap_mod_SOURCES = mmap/mmap.c mmap/i386/uppermem.c mmap/i386/pc/mmap.c \
+ mmap/i386/pc/mmap_helper.S
+mmap_mod_CFLAGS = $(COMMON_CFLAGS)
+mmap_mod_LDFLAGS = $(COMMON_LDFLAGS)
+mmap_mod_ASFLAGS = $(COMMON_ASFLAGS)
# For biosdisk.mod.
biosdisk_mod_SOURCES = disk/i386/pc/biosdisk.c
diff --git a/include/grub/i386/bsd.h b/include/grub/i386/bsd.h
index f50f18e..78fae79 100644
--- a/include/grub/i386/bsd.h
+++ b/include/grub/i386/bsd.h
@@ -148,6 +148,8 @@ struct grub_openbsd_bios_mmap
{
grub_uint64_t addr;
grub_uint64_t len;
+#define OPENBSD_MMAP_AVAILABLE 1
+#define OPENBSD_MMAP_RESERVED 2
grub_uint32_t type;
};
diff --git a/include/grub/i386/pc/memory.h b/include/grub/i386/pc/memory.h
index 08e92a9..610c65a 100644
--- a/include/grub/i386/pc/memory.h
+++ b/include/grub/i386/pc/memory.h
@@ -25,6 +25,7 @@
#ifndef ASM_FILE
#include <grub/types.h>
#include <grub/err.h>
+#include <grub/memory.h>
#endif
/* The scratch buffer used in real mode code. */
@@ -79,12 +80,6 @@
#ifndef ASM_FILE
-#ifndef GRUB_MACHINE_IEEE1275
-extern grub_size_t EXPORT_VAR(grub_lower_mem);
-#endif
-
-extern grub_size_t EXPORT_VAR(grub_upper_mem);
-
struct grub_machine_mmap_entry
{
grub_uint32_t size;
@@ -92,12 +87,40 @@ struct grub_machine_mmap_entry
grub_uint64_t len;
#define GRUB_MACHINE_MEMORY_AVAILABLE 1
#define GRUB_MACHINE_MEMORY_RESERVED 2
+#define GRUB_MACHINE_MEMORY_ACPI 3
+#define GRUB_MACHINE_MEMORY_NVS 4
+#define GRUB_MACHINE_MEMORY_MAX_TYPE 4
+ /* This one is special: it's used internally but is never reported
+ by firmware. */
+#define GRUB_MACHINE_MEMORY_HOLE 5
+
grub_uint32_t type;
} __attribute__((packed));
grub_err_t EXPORT_FUNC(grub_machine_mmap_iterate)
(int NESTED_FUNC_ATTR (*hook) (grub_uint64_t, grub_uint64_t, grub_uint32_t));
+grub_uint64_t grub_mmap_get_post64 (void);
+grub_uint64_t grub_mmap_get_upper (void);
+grub_uint64_t grub_mmap_get_lower (void);
+
+#ifdef GRUB_MACHINE_PCBIOS
+grub_err_t grub_machine_mmap_register (grub_uint64_t start, grub_uint64_t size,
+ int type, int handle);
+grub_err_t grub_machine_mmap_unregister (int handle);
+#else
+static inline grub_err_t grub_machine_mmap_register (grub_uint64_t start,
+ grub_uint64_t size,
+ int type, int handle)
+{
+ return GRUB_ERR_NONE;
+}
+static inline grub_err_t grub_machine_mmap_unregister (int handle)
+{
+ return GRUB_ERR_NONE;
+}
+#endif
+
#endif
#endif /* ! GRUB_MEMORY_MACHINE_HEADER */
diff --git a/include/grub/memory.h b/include/grub/memory.h
new file mode 100644
index 0000000..03a8516
--- /dev/null
+++ b/include/grub/memory.h
@@ -0,0 +1,34 @@
+/* memory.h - describe the memory map */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2002,2007,2008 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MEMORY_HEADER
+#define GRUB_MEMORY_HEADER 1
+
+#include <grub/types.h>
+#include <grub/err.h>
+
+grub_err_t
+grub_mmap_iterate (int NESTED_FUNC_ATTR (*hook) (grub_uint64_t,
+ grub_uint64_t, grub_uint32_t));
+int
+grub_mmap_register (grub_uint64_t start, grub_uint64_t size, int type);
+grub_err_t
+grub_mmap_unregister (int handle);
+
+#endif /* ! GRUB_MEMORY_HEADER */
diff --git a/include/grub/types.h b/include/grub/types.h
index 8d51b66..faf2257 100644
--- a/include/grub/types.h
+++ b/include/grub/types.h
@@ -100,6 +100,16 @@ typedef grub_int32_t grub_ssize_t;
# define LONG_MAX 2147483647UL
#endif
+#if GRUB_CPU_SIZEOF_VOID_P == 4
+#define UINT_TO_PTR(x) ((void*)(grub_uint32_t)(x))
+#define PTR_TO_UINT64(x) ((grub_uint64_t)(grub_uint32_t)(x))
+#define PTR_TO_UINT32(x) ((grub_uint32_t)(x))
+#else
+#define UINT_TO_PTR(x) ((void*)(grub_uint64_t)(x))
+#define PTR_TO_UINT64(x) ((grub_uint64_t)(x))
+#define PTR_TO_UINT32(x) ((grub_uint32_t)(grub_uint64_t)(x))
+#endif
+
/* The type for representing a file offset. */
typedef grub_uint64_t grub_off_t;
diff --git a/kern/i386/coreboot/init.c b/kern/i386/coreboot/init.c
index 1348488..2f7e875 100644
--- a/kern/i386/coreboot/init.c
+++ b/kern/i386/coreboot/init.c
@@ -82,16 +82,11 @@ grub_machine_init (void)
#if GRUB_CPU_SIZEOF_VOID_P == 4
/* Restrict ourselves to 32-bit memory space. */
if (addr > ULONG_MAX)
- {
- grub_upper_mem = ULONG_MAX;
- return 0;
- }
+ return 0;
if (addr + size > ULONG_MAX)
size = ULONG_MAX - addr;
#endif
- grub_upper_mem = grub_max (grub_upper_mem, addr + size);
-
if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
return 0;
@@ -128,9 +123,6 @@ grub_machine_init (void)
grub_machine_mmap_init ();
grub_machine_mmap_iterate (heap_init);
- /* This variable indicates size, not offset. */
- grub_upper_mem -= GRUB_MEMORY_MACHINE_UPPER_START;
-
grub_tsc_init ();
}
diff --git a/kern/i386/pc/init.c b/kern/i386/pc/init.c
index 6191412..c64497e 100644
--- a/kern/i386/pc/init.c
+++ b/kern/i386/pc/init.c
@@ -45,7 +45,6 @@ static int num_regions;
grub_addr_t grub_os_area_addr;
grub_size_t grub_os_area_size;
-grub_size_t grub_lower_mem, grub_upper_mem;
void
grub_arch_sync_caches (void *address __attribute__ ((unused)),
@@ -133,6 +132,7 @@ void
grub_machine_init (void)
{
int i;
+ int grub_lower_mem;
/* Initialize the console as early as possible. */
grub_console_init ();
@@ -197,7 +197,6 @@ grub_machine_init (void)
{
grub_size_t quarter = mem_regions[i].size >> 2;
- grub_upper_mem = mem_regions[i].size;
grub_os_area_addr = mem_regions[i].addr;
grub_os_area_size = mem_regions[i].size - quarter;
grub_mm_init_region ((void *) (grub_os_area_addr + grub_os_area_size),
diff --git a/loader/i386/bsd.c b/loader/i386/bsd.c
index 355cb3f..ea51aa2 100644
--- a/loader/i386/bsd.c
+++ b/loader/i386/bsd.c
@@ -313,30 +313,36 @@ static grub_err_t
grub_openbsd_boot (void)
{
char *buf = (char *) GRUB_BSD_TEMP_BUFFER;
- struct grub_machine_mmap_entry mmap;
struct grub_openbsd_bios_mmap *pm;
struct grub_openbsd_bootargs *pa;
- grub_uint32_t bootdev, biosdev, unit, slice, part, cont;
+ grub_uint32_t bootdev, biosdev, unit, slice, part;
+
+ auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
+ int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type)
+ {
+ pm->addr = addr;
+ pm->len = size;
+
+ switch (type)
+ {
+ case GRUB_MACHINE_MEMORY_AVAILABLE:
+ pm->type = OPENBSD_MMAP_AVAILABLE;
+ break;
+
+ default:
+ pm->type = OPENBSD_MMAP_RESERVED;
+ break;
+ }
+ pm++;
+
+ return 0;
+ }
pa = (struct grub_openbsd_bootargs *) buf;
pa->ba_type = OPENBSD_BOOTARG_MMAP;
pm = (struct grub_openbsd_bios_mmap *) (pa + 1);
- cont = grub_get_mmap_entry (&mmap, 0);
- if (mmap.size)
- do
- {
- pm->addr = mmap.addr;
- pm->len = mmap.len;
- pm->type = mmap.type;
- pm++;
-
- if (!cont)
- break;
-
- cont = grub_get_mmap_entry (&mmap, cont);
- }
- while (mmap.size);
+ grub_mmap_iterate (hook);
pa->ba_size = (char *) pm - (char *) pa;
pa->ba_next = (struct grub_openbsd_bootargs *) pm;
@@ -349,7 +355,8 @@ grub_openbsd_boot (void)
(part << OPENBSD_B_PARTSHIFT));
grub_unix_real_boot (entry, bootflags, bootdev, OPENBSD_BOOTARG_APIVER,
- 0, grub_upper_mem >> 10, grub_lower_mem >> 10,
+ 0, grub_mmap_get_upper () >> 10,
+ grub_mmap_get_lower () >> 10,
(char *) pa - buf, buf);
/* Not reached. */
@@ -377,7 +384,8 @@ grub_netbsd_boot (void)
bootinfo->bi_data[0] = rootdev;
grub_unix_real_boot (entry, bootflags, 0, bootinfo,
- 0, grub_upper_mem >> 10, grub_lower_mem >> 10);
+ 0, grub_mmap_get_upper () >> 10,
+ grub_mmap_get_lower () >> 10);
/* Not reached. */
return GRUB_ERR_NONE;
diff --git a/loader/i386/ieee1275/linux.c b/loader/i386/ieee1275/linux.c
index 2f52880..a563577 100644
--- a/loader/i386/ieee1275/linux.c
+++ b/loader/i386/ieee1275/linux.c
@@ -100,7 +100,7 @@ grub_linux_boot (void)
grub_memset ((char *) params, 0, GRUB_OFW_LINUX_CL_OFFSET);
- params->alt_mem = grub_upper_mem >> 10;
+ params->alt_mem = grub_mmap_get_upper () >> 10;
params->ext_mem = params->alt_mem;
lh->cmd_line_ptr = (char *)
diff --git a/loader/i386/linux.c b/loader/i386/linux.c
index 01d10d5..aac9bf3 100644
--- a/loader/i386/linux.c
+++ b/loader/i386/linux.c
@@ -168,7 +168,7 @@ find_mmap_size (void)
return 0;
}
- grub_machine_mmap_iterate (hook);
+ grub_mmap_iterate (hook);
mmap_size = count * sizeof (struct grub_e820_mmap);
@@ -237,7 +237,7 @@ allocate_pages (grub_size_t prot_size)
return 0;
}
- grub_machine_mmap_iterate (hook);
+ grub_mmap_iterate (hook);
if (! real_mode_mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate real mode pages");
@@ -404,7 +404,7 @@ grub_linux_boot (void)
}
e820_num = 0;
- grub_machine_mmap_iterate (hook);
+ grub_mmap_iterate (hook);
params->mmap_size = e820_num;
/* Hardware interrupts are not safe any longer. */
diff --git a/loader/i386/multiboot.c b/loader/i386/multiboot.c
index 27042a5..d38590f 100644
--- a/loader/i386/multiboot.c
+++ b/loader/i386/multiboot.c
@@ -100,7 +100,7 @@ grub_get_multiboot_mmap_len (void)
return 0;
}
- grub_machine_mmap_iterate (hook);
+ grub_mmap_iterate (hook);
return count * sizeof (struct grub_multiboot_mmap_entry);
}
@@ -123,7 +123,7 @@ grub_fill_multiboot_mmap (struct grub_multiboot_mmap_entry *first_entry)
return 0;
}
- grub_machine_mmap_iterate (hook);
+ grub_mmap_iterate (hook);
}
#define MULTIBOOT_LOAD_ELF64
@@ -342,8 +342,8 @@ grub_multiboot (int argc, char *argv[])
grub_multiboot_payload_entry_offset);
/* Convert from bytes to kilobytes. */
- mbi->mem_lower = grub_lower_mem / 1024;
- mbi->mem_upper = grub_upper_mem / 1024;
+ mbi->mem_lower = grub_mmap_get_lower () / 1024;
+ mbi->mem_upper = grub_mmap_get_upper () / 1024;
mbi->flags |= MULTIBOOT_INFO_MEMORY;
cmdline = p = cmdline_addr (grub_multiboot_payload_orig);
diff --git a/loader/i386/pc/linux.c b/loader/i386/pc/linux.c
index 8ff97f4..34a4ebc 100644
--- a/loader/i386/pc/linux.c
+++ b/loader/i386/pc/linux.c
@@ -108,8 +108,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
lh.type_of_loader = GRUB_LINUX_BOOT_LOADER_TYPE;
/* Put the real mode part at as a high location as possible. */
- grub_linux_real_addr = (char *) (grub_lower_mem
- - GRUB_LINUX_SETUP_MOVE_SIZE);
+ grub_linux_real_addr
+ = (char *) UINT_TO_PTR (grub_mmap_get_lower ()
+ - GRUB_LINUX_SETUP_MOVE_SIZE);
/* But it must not exceed the traditional area. */
if (grub_linux_real_addr > (char *) GRUB_LINUX_OLD_REAL_MODE_ADDR)
grub_linux_real_addr = (char *) GRUB_LINUX_OLD_REAL_MODE_ADDR;
@@ -159,12 +160,12 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
}
if (grub_linux_real_addr + GRUB_LINUX_SETUP_MOVE_SIZE
- > (char *) grub_lower_mem)
+ > (char *) UINT_TO_PTR (grub_mmap_get_lower ()))
{
grub_error (GRUB_ERR_OUT_OF_RANGE,
"too small lower memory (0x%x > 0x%x)",
- grub_linux_real_addr + GRUB_LINUX_SETUP_MOVE_SIZE,
- (char *) grub_lower_mem);
+ grub_linux_real_addr + GRUB_LINUX_SETUP_MOVE_SIZE,
+ (int) grub_mmap_get_lower ());
goto fail;
}
diff --git a/mmap/i386/pc/mmap.c b/mmap/i386/pc/mmap.c
new file mode 100644
index 0000000..3b45de4
--- /dev/null
+++ b/mmap/i386/pc/mmap.c
@@ -0,0 +1,240 @@
+/* Mmap management. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/machine/memory.h>
+#include <grub/memory.h>
+#include <grub/loader.h>
+#include <grub/misc.h>
+#include <grub/term.h>
+
+#define min(a,b) (((a) < (b)) ? (a) : (b))
+
+static void *hooktarget = 0;
+
+extern grub_uint8_t grub_machine_mmaphook_start;
+extern grub_uint8_t grub_machine_mmaphook_end;
+extern grub_uint8_t grub_machine_mmaphook_int12;
+extern grub_uint8_t grub_machine_mmaphook_int15;
+
+static grub_uint16_t grub_machine_mmaphook_int12offset = 0;
+static grub_uint16_t grub_machine_mmaphook_int12segment = 0;
+extern grub_uint16_t grub_machine_mmaphook_int15offset;
+extern grub_uint16_t grub_machine_mmaphook_int15segment;
+
+extern grub_uint16_t grub_machine_mmaphook_mmap_num;
+extern grub_uint16_t grub_machine_mmaphook_kblow;
+extern grub_uint16_t grub_machine_mmaphook_kbin16mb;
+extern grub_uint16_t grub_machine_mmaphook_64kbin4gb;
+
+struct grub_e820_mmap_entry
+{
+ grub_uint64_t addr;
+ grub_uint64_t len;
+ grub_uint32_t type;
+} __attribute__((packed));
+
+
+static grub_err_t
+preboot (int noreturn __attribute__ ((unused)))
+{
+ struct grub_e820_mmap_entry *hookmmap, *hookmmapcur;
+ auto int NESTED_FUNC_ATTR fill_hook (grub_uint64_t, grub_uint64_t,
+ grub_uint32_t);
+ int NESTED_FUNC_ATTR fill_hook (grub_uint64_t addr, grub_uint64_t size,
+ grub_uint32_t type)
+ {
+ grub_dprintf ("mmap", "mmap chunk %llx-%llx:%x\n", addr, addr + size, type);
+ hookmmapcur->addr = addr;
+ hookmmapcur->len = size;
+ hookmmapcur->type = type;
+ hookmmapcur++;
+ return 0;
+ }
+
+ if (! hooktarget)
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ "no space is allocated for memory hook");
+
+ grub_dprintf ("mmap", "installing preboot handlers\n");
+
+ hookmmapcur = hookmmap = (struct grub_e820_mmap_entry *)
+ ((grub_uint8_t *) hooktarget + (&grub_machine_mmaphook_end
+ - &grub_machine_mmaphook_start));
+
+ grub_mmap_iterate (fill_hook);
+ grub_machine_mmaphook_mmap_num = hookmmapcur - hookmmap;
+
+ grub_machine_mmaphook_kblow = grub_mmap_get_lower () >> 10;
+ grub_machine_mmaphook_kbin16mb
+ = min (grub_mmap_get_upper (),0x3f00000ULL) >> 10;
+ grub_machine_mmaphook_64kbin4gb
+ = min (grub_mmap_get_post64 (), 0xfc000000ULL) >> 16;
+
+ /* Correct BDA. */
+ *((grub_uint16_t *) 0x413) = grub_mmap_get_lower () >> 10;
+
+ /* Save old interrupt handlers. */
+ grub_machine_mmaphook_int12offset = *((grub_uint16_t *) 0x48);
+ grub_machine_mmaphook_int12segment = *((grub_uint16_t *) 0x4a);
+ grub_machine_mmaphook_int15offset = *((grub_uint16_t *) 0x54);
+ grub_machine_mmaphook_int15segment = *((grub_uint16_t *) 0x56);
+
+ grub_dprintf ("mmap", "hooktarget = %p\n", hooktarget);
+
+ /* Install the interrupt handlers. */
+ grub_memcpy (hooktarget, &grub_machine_mmaphook_start,
+ &grub_machine_mmaphook_end - &grub_machine_mmaphook_start);
+
+ *((grub_uint16_t *) 0x4a) = PTR_TO_UINT32 (hooktarget) >> 4;
+ *((grub_uint16_t *) 0x56) = PTR_TO_UINT32 (hooktarget) >> 4;
+ *((grub_uint16_t *) 0x48) = &grub_machine_mmaphook_int12
+ - &grub_machine_mmaphook_start;
+ *((grub_uint16_t *) 0x54) = &grub_machine_mmaphook_int15
+ - &grub_machine_mmaphook_start;
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+preboot_rest (void)
+{
+ /* Restore old interrupt handlers. */
+ *((grub_uint16_t *) 0x48) = grub_machine_mmaphook_int12offset;
+ *((grub_uint16_t *) 0x4a) = grub_machine_mmaphook_int12segment;
+ *((grub_uint16_t *) 0x54) = grub_machine_mmaphook_int15offset;
+ *((grub_uint16_t *) 0x56) = grub_machine_mmaphook_int15segment;
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+malloc_hook (void)
+{
+ static int reentry = 0;
+ static int mmapregion = 0;
+ static int slots_available = 0;
+ int hooksize;
+ int regcount = 0;
+ grub_uint64_t highestlow = 0;
+ auto int NESTED_FUNC_ATTR count_hook (grub_uint64_t, grub_uint64_t,
+ grub_uint32_t);
+ int NESTED_FUNC_ATTR count_hook (grub_uint64_t addr __attribute__ ((unused)),
+ grub_uint64_t size __attribute__ ((unused)),
+ grub_uint32_t type __attribute__ ((unused)))
+ {
+ regcount++;
+ return 0;
+ }
+
+ auto int NESTED_FUNC_ATTR find_hook (grub_uint64_t, grub_uint64_t,
+ grub_uint32_t);
+ int NESTED_FUNC_ATTR find_hook (grub_uint64_t start, grub_uint64_t size,
+ grub_uint32_t type)
+ {
+ grub_uint64_t end = start + size;
+ if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
+ return 0;
+ if (end > 0x100000)
+ end = 0x100000;
+ if (end > start + hooksize
+ && highestlow < ((end - hooksize) & (~0xf)) )
+ highestlow = (end - hooksize) & (~0xf);
+ return 0;
+ }
+
+ if (reentry)
+ return GRUB_ERR_NONE;
+
+ grub_dprintf ("mmap", "registering\n");
+
+ grub_mmap_iterate (count_hook);
+
+ /* Mapping hook itself may introduce up to 2 additional regions. */
+ regcount += 2;
+
+ if (regcount <= slots_available)
+ return GRUB_ERR_NONE;
+
+ if (mmapregion)
+ {
+ grub_mmap_unregister (mmapregion);
+ mmapregion = 0;
+ hooktarget = 0;
+ }
+
+ hooksize = &grub_machine_mmaphook_end - &grub_machine_mmaphook_start
+ + regcount * sizeof (struct grub_e820_mmap_entry);
+ /* Allocate an integer number of KiB. */
+ hooksize = ((hooksize - 1) | 0x3ff) + 1;
+ slots_available = (hooksize - (&grub_machine_mmaphook_end
+ - &grub_machine_mmaphook_start))
+ / sizeof (struct grub_e820_mmap_entry);
+
+ /* FIXME: use low-memory mm allocation once it's available. */
+ grub_mmap_iterate (find_hook);
+ if (! highestlow)
+ {
+ slots_available = 0;
+ hooktarget = 0;
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, "No space for mmap hook");
+ }
+
+ hooktarget = UINT_TO_PTR (highestlow);
+
+ reentry = 1;
+ mmapregion = grub_mmap_register (PTR_TO_UINT64 (hooktarget), hooksize,
+ GRUB_MACHINE_MEMORY_RESERVED);
+ reentry = 0;
+ if (! mmapregion)
+ {
+ slots_available = 0;
+ hooktarget = 0;
+ return grub_errno;
+ }
+ return GRUB_ERR_NONE;
+}
+
+grub_err_t
+grub_machine_mmap_register (grub_uint64_t start __attribute__ ((unused)),
+ grub_uint64_t size __attribute__ ((unused)),
+ int type __attribute__ ((unused)),
+ int handle __attribute__ ((unused)))
+{
+ grub_err_t err;
+ static void *preb_handle = 0;
+
+ if ((err = malloc_hook ()))
+ return err;
+
+ if (! preb_handle)
+ {
+ grub_dprintf ("mmap", "adding preboot\n");
+ preb_handle = grub_loader_register_preboot_hook (preboot, preboot_rest,
+ -10);
+ if (! preb_handle)
+ return grub_errno;
+ }
+ return GRUB_ERR_NONE;
+}
+
+grub_err_t
+grub_machine_mmap_unregister (int handle __attribute__ ((unused)))
+{
+ return GRUB_ERR_NONE;
+}
diff --git a/mmap/i386/pc/mmap_helper.S b/mmap/i386/pc/mmap_helper.S
new file mode 100644
index 0000000..ab7c0d2
--- /dev/null
+++ b/mmap/i386/pc/mmap_helper.S
@@ -0,0 +1,122 @@
+/* Mmap management. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+#define DS(x) ((x) - segstart)
+
+segstart:
+VARIABLE(grub_machine_mmaphook_start)
+ .code16
+VARIABLE(grub_machine_mmaphook_int12)
+ push %ds
+ push %cs
+ pop %ds
+ movw DS (EXT_C (grub_machine_mmaphook_kblow)), %ax
+ pop %ds
+ iret
+
+VARIABLE(grub_machine_mmaphook_int15)
+ pushf
+ cmpw $0xe801, %ax
+ jz e801
+ cmpw $0xe820, %ax
+ jz e820
+ cmpb $0x88, %ah
+ jz h88
+ popf
+ /* ljmp */
+ .byte 0xea
+VARIABLE (grub_machine_mmaphook_int15offset)
+ .word 0
+VARIABLE (grub_machine_mmaphook_int15segment)
+ .word 0
+
+e801:
+ popf
+ push %ds
+ push %cs
+ pop %ds
+ movw DS (EXT_C (grub_machine_mmaphook_kbin16mb)), %ax
+ movw DS (EXT_C (grub_machine_mmaphook_64kbin4gb)), %bx
+ movw %ax, %cx
+ movw %bx, %dx
+ pop %ds
+ clc
+ iret
+
+h88:
+ popf
+ push %ds
+ push %cs
+ pop %ds
+ movw DS (EXT_C (grub_machine_mmaphook_kbin16mb)), %ax
+ pop %ds
+ clc
+ iret
+
+e820:
+ popf
+ push %ds
+ push %cs
+ pop %ds
+ cmpw $20, %cx
+ jb errexit
+ cmpw DS (EXT_C (grub_machine_mmaphook_mmap_num)), %bx
+ jae errexit
+ cmp $0x534d4150, %edx
+ jne errexit
+ push %si
+ push %di
+ movw $20, %cx
+ movw $(DS(mmaphook_mmap)), %si
+ mov %bx, %ax
+ imul $20, %ax
+ add %ax, %si
+ rep movsb
+ pop %di
+ pop %si
+ movl $20, %ecx
+ inc %bx
+ cmpw DS(EXT_C(grub_machine_mmaphook_mmap_num)), %bx
+ jb noclean
+ xor %bx, %bx
+noclean:
+ mov $0x534d4150, %eax
+ pop %ds
+ clc
+ iret
+errexit:
+ mov $0x534d4150, %eax
+ pop %ds
+ stc
+ xor %bx, %bx
+ iret
+
+VARIABLE(grub_machine_mmaphook_mmap_num)
+ .word 0
+VARIABLE(grub_machine_mmaphook_kblow)
+ .word 0
+VARIABLE (grub_machine_mmaphook_kbin16mb)
+ .word 0
+VARIABLE (grub_machine_mmaphook_64kbin4gb)
+ .word 0
+mmaphook_mmap:
+ /* Memory map is placed just after the interrupt handlers. */
+VARIABLE(grub_machine_mmaphook_end)
diff --git a/mmap/i386/uppermem.c b/mmap/i386/uppermem.c
new file mode 100644
index 0000000..1fb339d
--- /dev/null
+++ b/mmap/i386/uppermem.c
@@ -0,0 +1,85 @@
+/* Compute amount of lower and upper memory till the first hole. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/machine/memory.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+
+grub_uint64_t
+grub_mmap_get_lower (void)
+{
+ grub_uint64_t lower = 0;
+
+ auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
+ int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
+ grub_uint32_t type)
+ {
+ if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
+ return 0;
+ if (addr == 0)
+ lower = size;
+ return 0;
+ }
+
+ grub_mmap_iterate (hook);
+ if (lower > 0x100000)
+ lower = 0x100000;
+ return lower;
+}
+
+grub_uint64_t
+grub_mmap_get_upper (void)
+{
+ grub_uint64_t upper = 0;
+
+ auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
+ int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
+ grub_uint32_t type)
+ {
+ if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
+ return 0;
+ if (addr <= 0x100000 && addr + size > 0x100000)
+ upper = addr + size - 0x100000;
+ return 0;
+ }
+
+ grub_mmap_iterate (hook);
+ return upper;
+}
+
+/* Count the continous bytes after 64 MiB. */
+grub_uint64_t
+grub_mmap_get_post64 (void)
+{
+ grub_uint64_t post64 = 0;
+
+ auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
+ int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size,
+ grub_uint32_t type)
+ {
+ if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
+ return 0;
+ if (addr <= 0x4000000 && addr + size > 0x4000000)
+ post64 = addr + size - 0x4000000;
+ return 0;
+ }
+
+ grub_mmap_iterate (hook);
+ return post64;
+}
diff --git a/mmap/mmap.c b/mmap/mmap.c
new file mode 100644
index 0000000..01480ff
--- /dev/null
+++ b/mmap/mmap.c
@@ -0,0 +1,364 @@
+/* Mmap management. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/machine/memory.h>
+#include <grub/memory.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/command.h>
+#include <grub/dl.h>
+
+#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
+
+struct region
+{
+ struct region *next;
+ grub_uint64_t start;
+ grub_uint64_t end;
+ int type;
+ int handle;
+};
+
+static struct region *overlays = 0;
+static int curhandle = 1;
+
+grub_err_t
+grub_mmap_iterate (int NESTED_FUNC_ATTR (*hook) (grub_uint64_t,
+ grub_uint64_t, grub_uint32_t))
+{
+ /* This function resolves overlapping regions and sorts the memory map.
+ It uses scanline (sweeping) algorithm.
+ */
+ /* If same page is used by multiple types it's resolved
+ according to priority:
+ 1 - free memory
+ 2 - memory usable by firmware-aware code
+ 3 - unusable memory
+ 4 - a range deliberately empty
+ */
+ int priority[GRUB_MACHINE_MEMORY_MAX_TYPE + 2] =
+ {
+#ifdef GRUB_MACHINE_MEMORY_AVAILABLE
+ [GRUB_MACHINE_MEMORY_AVAILABLE] = 1,
+#endif
+#ifdef GRUB_MACHINE_MEMORY_RESERVED
+ [GRUB_MACHINE_MEMORY_RESERVED] = 3,
+#endif
+#ifdef GRUB_MACHINE_MEMORY_ACPI
+ [GRUB_MACHINE_MEMORY_ACPI] = 2,
+#endif
+#ifdef GRUB_MACHINE_MEMORY_NVS
+ [GRUB_MACHINE_MEMORY_NVS] = 3,
+#endif
+ [GRUB_MACHINE_MEMORY_HOLE] = 4,
+ };
+
+ int i, k, done;
+
+ /* Scanline events. */
+ struct grub_mmap_scan
+ {
+ /* At which memory address. */
+ grub_uint64_t pos;
+ /* 0 = region starts, 1 = region ends. */
+ int type;
+ /* Which type of memory region? */
+ int memtype;
+ };
+ struct grub_mmap_scan *scanline_events;
+ struct grub_mmap_scan t;
+
+ /* Previous scanline event. */
+ grub_uint64_t lastaddr;
+ int lasttype;
+ /* Current scanline event. */
+ int curtype;
+ /* How many regions of given type overlap at current location? */
+ int present[GRUB_MACHINE_MEMORY_MAX_TYPE + 2];
+ /* Number of mmap chunks. */
+ int mmap_num;
+
+ struct region *cur;
+
+ auto int NESTED_FUNC_ATTR count_hook (grub_uint64_t, grub_uint64_t,
+ grub_uint32_t);
+ int NESTED_FUNC_ATTR count_hook (grub_uint64_t addr __attribute__ ((unused)),
+ grub_uint64_t size __attribute__ ((unused)),
+ grub_uint32_t type __attribute__ ((unused)))
+ {
+ mmap_num++;
+ return 0;
+ }
+
+ auto int NESTED_FUNC_ATTR fill_hook (grub_uint64_t, grub_uint64_t,
+ grub_uint32_t);
+ int NESTED_FUNC_ATTR fill_hook (grub_uint64_t addr,
+ grub_uint64_t size,
+ grub_uint32_t type)
+ {
+ scanline_events[i].pos = addr;
+ scanline_events[i].type = 0;
+ if (type <= GRUB_MACHINE_MEMORY_MAX_TYPE && priority[type])
+ scanline_events[i].memtype = type;
+ else
+ {
+ grub_dprintf ("mmap", "Unknown memory type %d. Assuming unusable\n",
+ type);
+ scanline_events[i].memtype = GRUB_MACHINE_MEMORY_RESERVED;
+ }
+ i++;
+
+ scanline_events[i].pos = addr + size;
+ scanline_events[i].type = 1;
+ scanline_events[i].memtype = scanline_events[i - 1].memtype;
+ i++;
+
+ return 0;
+ }
+
+ mmap_num = 0;
+ for (cur = overlays; cur; cur = cur->next)
+ mmap_num++;
+ grub_machine_mmap_iterate (count_hook);
+
+ /* Initialize variables. */
+ grub_memset (present, 0, sizeof (present));
+ scanline_events = (struct grub_mmap_scan *)
+ grub_malloc (sizeof (struct grub_mmap_scan) * 2 * mmap_num);
+
+ if (! scanline_events)
+ {
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ "couldn't allocate space for new memory map");
+ }
+
+ /* Register scanline events. */
+ for (cur = overlays, i = 0; cur; cur = cur->next)
+ {
+ scanline_events[i].pos = cur->start;
+ scanline_events[i].type = 0;
+ if (cur->type == GRUB_MACHINE_MEMORY_HOLE
+ || (cur->type >= 0 && cur->type <= GRUB_MACHINE_MEMORY_MAX_TYPE
+ && priority[cur->type]))
+ scanline_events[i].memtype = cur->type;
+ else
+ scanline_events[i].memtype = GRUB_MACHINE_MEMORY_RESERVED;
+ i++;
+
+ scanline_events[i].pos = cur->end;
+ scanline_events[i].type = 1;
+ scanline_events[i].memtype = scanline_events[i - 1].memtype;
+ i++;
+ }
+
+ grub_machine_mmap_iterate (fill_hook);
+
+ /* Primitive bubble sort. It has complexity O(n^2) but since we're
+ unlikely to have more than 100 chunks it's probably one of the
+ fastest for one purpose. */
+ done = 1;
+ while (done)
+ {
+ done = 0;
+ for (i = 0; i < 2 * mmap_num - 1; i++)
+ if (scanline_events[i + 1].pos < scanline_events[i].pos
+ || (scanline_events[i + 1].pos == scanline_events[i].pos
+ && scanline_events[i + 1].type == 0
+ && scanline_events[i].type == 1))
+ {
+ t = scanline_events[i + 1];
+ scanline_events[i + 1] = scanline_events[i];
+ scanline_events[i] = t;
+ done = 1;
+ }
+ }
+
+ lastaddr = scanline_events[0].pos;
+ lasttype = scanline_events[0].memtype;
+ for (i = 0; i < 2 * mmap_num; i++)
+ {
+ /* Process event. */
+ if (scanline_events[i].type)
+ present[scanline_events[i].memtype]--;
+ else
+ present[scanline_events[i].memtype]++;
+
+ /* Determine current region type. */
+ curtype = -1;
+ for (k = 0; k <= GRUB_MACHINE_MEMORY_MAX_TYPE + 1; k++)
+ if (present[k] && (curtype == -1 || priority[k] > priority[curtype]))
+ curtype = k;
+
+ /* Anounce region to the hook if necessary. */
+ if ((curtype == -1 || curtype != lasttype)
+ && lastaddr != scanline_events[i].pos
+ && lasttype != -1
+ && lasttype != GRUB_MACHINE_MEMORY_HOLE
+ && hook (lastaddr, scanline_events[i].pos - lastaddr, lasttype))
+ {
+ grub_free (scanline_events);
+ return GRUB_ERR_NONE;
+ }
+
+ /* Update last values if necessary. */
+ if (curtype == -1 || curtype != lasttype)
+ {
+ lasttype = curtype;
+ lastaddr = scanline_events[i].pos;
+ }
+ }
+
+ grub_free (scanline_events);
+ return GRUB_ERR_NONE;
+}
+
+int
+grub_mmap_register (grub_uint64_t start, grub_uint64_t size, int type)
+{
+ struct region *cur;
+
+ grub_dprintf ("mmap", "registering\n");
+
+ cur = (struct region *) grub_malloc (sizeof (struct region));
+ if (! cur)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ "couldn't allocate memory map overlay");
+ return 0;
+ }
+
+ cur->next = overlays;
+ cur->start = start;
+ cur->end = start + size;
+ cur->type = type;
+ cur->handle = curhandle++;
+ overlays = cur;
+
+ if (grub_machine_mmap_register (start, size, type, curhandle))
+ {
+ overlays = cur->next;
+ grub_free (cur);
+ return 0;
+ }
+
+ return cur->handle;
+}
+
+grub_err_t
+grub_mmap_unregister (int handle)
+{
+ struct region *cur, *prev;
+
+ for (cur = overlays, prev = 0; cur; prev= cur, cur = cur->next)
+ if (handle == cur->handle)
+ {
+ grub_err_t err;
+ if ((err = grub_machine_mmap_unregister (handle)))
+ return err;
+
+ if (prev)
+ prev->next = cur->next;
+ else
+ overlays = cur->next;
+ grub_free (cur);
+ return GRUB_ERR_NONE;
+ }
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "mmap overlay not found");
+}
+
+#endif /* ! GRUB_MMAP_REGISTER_BY_FIRMWARE */
+
+#define CHUNK_SIZE 0x400
+
+static grub_err_t
+grub_cmd_badram (grub_command_t cmd __attribute__ ((unused)),
+ int argc, char **args)
+{
+ char * str;
+ grub_uint64_t badaddr, badmask;
+
+ auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
+ int NESTED_FUNC_ATTR hook (grub_uint64_t addr,
+ grub_uint64_t size,
+ grub_uint32_t type __attribute__ ((unused)))
+ {
+ grub_uint64_t start;
+ grub_dprintf ("badram", "hook %llx+%llx\n", addr,size);
+
+ /* FIXME: use more efficient algorithm. */
+ for (start = (addr & ~(CHUNK_SIZE - 1)); start < addr + size;
+ start += CHUNK_SIZE)
+ if (((start ^ badaddr) & badmask) == 0)
+ {
+ grub_dprintf ("badram", "%llx is a bad boy\n", start);
+ grub_mmap_register (start, CHUNK_SIZE, GRUB_MACHINE_MEMORY_HOLE);
+ }
+ return 0;
+ }
+
+ if (argc != 1)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "badram string required");
+
+ grub_dprintf ("badram", "executing badram\n");
+
+ str = args[0];
+
+ while (1)
+ {
+ /* Parse address and mask. */
+ badaddr = grub_strtoull (str, &str, 16);
+ if (*str == ',')
+ str++;
+ badmask = grub_strtoull (str, &str, 16);
+ if (*str == ',')
+ str++;
+
+ if (grub_errno == GRUB_ERR_BAD_NUMBER)
+ {
+ grub_errno = 0;
+ return GRUB_ERR_NONE;
+ }
+
+ /* When part of a page is tainted, we discard the whole of it. There's
+ no point in providing sub-page chunks. */
+ badmask &= ~(CHUNK_SIZE - 1);
+
+ grub_dprintf ("badram", "badram %llx:%llx\n", badaddr, badmask);
+
+ grub_mmap_iterate (hook);
+ }
+}
+
+static grub_command_t cmd;
+
+
+GRUB_MOD_INIT(mmap)
+{
+ (void) mod; /* To stop warning. */
+ cmd = grub_register_command ("badram", grub_cmd_badram,
+ "badram ADDR1,MASK1[,ADDR2,MASK2[,...]]",
+ "declare memory regions as badram");
+}
+
+GRUB_MOD_FINI(mmap)
+{
+ grub_unregister_command (cmd);
+}
+
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