Add the ability for a classic ppc kernel to be loaded at
an address of 32MB. This done by fixing a few places that
assume we are loaded at address 0, and by changing several
uses of KERNELBASE to use PAGE_OFFSET, instead. We also
wire up the trampoline code for ppc32 to relay exceptions
from the vectors at address 0 to vectors at address 32MB.
Signed-off-by: Dale Farnsworth <[EMAIL PROTECTED]>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/kernel/crash_dump.c | 1 +
arch/powerpc/kernel/head_32.S | 11 ++++++-----
arch/powerpc/kernel/setup_32.c | 2 ++
arch/powerpc/kernel/vmlinux.lds.S | 4 +---
arch/powerpc/mm/init_32.c | 2 +-
arch/powerpc/mm/pgtable_32.c | 4 ++--
arch/powerpc/mm/ppc_mmu_32.c | 8 ++++----
include/asm-powerpc/ppc_asm.h | 4 ++--
9 files changed, 20 insertions(+), 18 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 9e9581a..805b4d1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -253,7 +253,7 @@ config KEXEC
config CRASH_DUMP
bool "Build a kdump crash kernel (EXPERIMENTAL)"
- depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
+ depends on PPC_MULTIPLATFORM && EXPERIMENTAL
help
Build a kernel suitable for use as a kdump capture kernel.
The kernel will be linked at a different address than normal, and
diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 29ff77c..77c0376 100644
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -40,6 +40,7 @@ static void __init create_trampoline(unsigned long addr)
* branch to "addr" we jump to ("addr" + 32 MB). Although it requires
* two instructions it doesn't require any registers.
*/
+ addr += PAGE_OFFSET;
create_instruction(addr, 0x60000000); /* nop */
create_branch(addr + 4, addr + PHYSICAL_START, 0);
}
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index a5b13ae..a9b50ab 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -175,7 +175,8 @@ __after_mmu_off:
bl reloc_offset
mr r26,r3
addis r4,r3,[EMAIL PROTECTED] /* current address of _start */
- cmpwi 0,r4,0 /* are we already running at 0? */
+ lis r5,[EMAIL PROTECTED]
+ cmplw 0,r4,r5 /* already running at PHYSICAL_START? */
bne relocate_kernel
/*
* we now have the 1st 16M of ram mapped with the bats.
@@ -818,13 +819,13 @@ giveup_altivec:
/*
* This code is jumped to from the startup code to copy
- * the kernel image to physical address 0.
+ * the kernel image to physical address PHYSICAL_START.
*/
relocate_kernel:
addis r9,r26,[EMAIL PROTECTED] /* fetch klimit */
lwz r25,[EMAIL PROTECTED](r9)
addis r25,r25,[EMAIL PROTECTED]
- li r3,0 /* Destination base address */
+ lis r3,[EMAIL PROTECTED] /* Destination base address */
li r6,0 /* Destination offset */
li r5,0x4000 /* # bytes of memory to copy */
bl copy_and_flush /* copy the first 0x4000 bytes */
@@ -1186,11 +1187,11 @@ mmu_off:
/*
* Use the first pair of BAT registers to map the 1st 16MB
- * of RAM to KERNELBASE. From this point on we can't safely
+ * of RAM to PAGE_OFFSET. From this point on we can't safely
* call OF any more.
*/
initial_bats:
- lis r11,[EMAIL PROTECTED]
+ lis r11,[EMAIL PROTECTED]
mfspr r9,SPRN_PVR
rlwinm r9,r9,16,16,31 /* r9 = 1 for 601, 4 for 604 */
cmpwi 0,r9,1
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index cd870a8..bbb4caf 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -128,6 +128,8 @@ void __init machine_init(unsigned long dt_ptr, unsigned
long phys)
probe_machine();
+ setup_kdump_trampoline();
+
#ifdef CONFIG_6xx
if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
cpu_has_feature(CPU_FTR_CAN_NAP))
diff --git a/arch/powerpc/kernel/vmlinux.lds.S
b/arch/powerpc/kernel/vmlinux.lds.S
index f66fa5d..242f17d 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -1,11 +1,9 @@
#ifdef CONFIG_PPC64
-#include <asm/page.h>
#define PROVIDE32(x) PROVIDE(__unused__##x)
#else
-#define PAGE_SIZE 4096
-#define KERNELBASE CONFIG_KERNEL_START
#define PROVIDE32(x) PROVIDE(x)
#endif
+#include <asm/page.h>
#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 977cb1e..a25d3d7 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -48,7 +48,7 @@
#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
/* The ammount of lowmem must be within 0xF0000000 - KERNELBASE. */
-#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE))
+#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
#endif
#endif
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 6448872..e7505ea 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -275,7 +275,7 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
}
/*
- * Map in all of physical memory starting at KERNELBASE.
+ * Map in all of physical memory starting at PAGE_OFFSET.
*/
void __init mapin_ram(void)
{
@@ -283,7 +283,7 @@ void __init mapin_ram(void)
int ktext;
s = mmu_mapin_ram();
- v = KERNELBASE + s;
+ v = PAGE_OFFSET + s;
p = PPC_MEMSTART + s;
for (; s < total_lowmem; s += PAGE_SIZE) {
ktext = ((char *) v >= _stext && (char *) v < etext);
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index 5c45d47..6316895 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -105,16 +105,16 @@ unsigned long __init mmu_mapin_ram(void)
break;
}
- setbat(2, KERNELBASE, PPC_MEMSTART, bl, _PAGE_RAM);
- done = (unsigned long)bat_addrs[2].limit - KERNELBASE + 1;
+ setbat(2, PAGE_OFFSET, PPC_MEMSTART, bl, _PAGE_RAM);
+ done = (unsigned long)bat_addrs[2].limit - PAGE_OFFSET + 1;
if ((done < tot) && !bat_addrs[3].limit) {
/* use BAT3 to cover a bit more */
tot -= done;
for (bl = 128<<10; bl < max_size; bl <<= 1)
if (bl * 2 > tot)
break;
- setbat(3, KERNELBASE+done, PPC_MEMSTART+done, bl, _PAGE_RAM);
- done = (unsigned long)bat_addrs[3].limit - KERNELBASE + 1;
+ setbat(3, PAGE_OFFSET+done, PPC_MEMSTART+done, bl, _PAGE_RAM);
+ done = (unsigned long)bat_addrs[3].limit - PAGE_OFFSET + 1;
}
return done;
diff --git a/include/asm-powerpc/ppc_asm.h b/include/asm-powerpc/ppc_asm.h
index 2dbd4e7..f8943ec 100644
--- a/include/asm-powerpc/ppc_asm.h
+++ b/include/asm-powerpc/ppc_asm.h
@@ -382,14 +382,14 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
#define fromreal(rd) tovirt(rd,rd)
#define tophys(rd,rs) \
-0: addis rd,rs,[EMAIL PROTECTED]; \
+0: addis rd,rs,[EMAIL PROTECTED]; \
.section ".vtop_fixup","aw"; \
.align 1; \
.long 0b; \
.previous
#define tovirt(rd,rs) \
-0: addis rd,rs,[EMAIL PROTECTED]; \
+0: addis rd,rs,[EMAIL PROTECTED]; \
.section ".ptov_fixup","aw"; \
.align 1; \
.long 0b; \
--
1.5.3.4
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