This adds a new mach device called mbinfo that exposes the multiboot
information to userspace.
---
i386/Makefrag.am | 2 ++
i386/i386at/conf.c | 8 +++++++
i386/i386at/mbinfo.c | 53 +++++++++++++++++++++++++++++++++++++++++
i386/i386at/mbinfo.h | 35 +++++++++++++++++++++++++++
i386/i386at/model_dep.c | 3 +++
5 files changed, 101 insertions(+)
create mode 100644 i386/i386at/mbinfo.c
create mode 100644 i386/i386at/mbinfo.h
diff --git a/i386/Makefrag.am b/i386/Makefrag.am
index 7a339417..906ccc2d 100644
--- a/i386/Makefrag.am
+++ b/i386/Makefrag.am
@@ -69,6 +69,8 @@ libkernel_a_SOURCES += \
i386/i386at/kd_mouse.h \
i386/i386at/kdasm.S \
i386/i386at/kdsoft.h \
+ i386/i386at/mbinfo.c \
+ i386/i386at/mbinfo.h \
i386/i386at/mem.c \
i386/i386at/mem.h \
i386/i386at/rtc.c \
diff --git a/i386/i386at/conf.c b/i386/i386at/conf.c
index ecbf1e45..ba056ea1 100644
--- a/i386/i386at/conf.c
+++ b/i386/i386at/conf.c
@@ -71,6 +71,9 @@
#include <device/intr.h>
#define irqname "irq"
+#include <i386at/mbinfo.h>
+#define mbinfoname "mbinfo"
+
/*
* List of devices - console must be at slot 0
*/
@@ -157,6 +160,11 @@ struct dev_ops dev_name_list[] =
nodev_async_in, nulldev_reset, nulldev_portdeath,0,
nodev_info },
+ { mbinfoname, nulldev_open, nulldev_close, mbinforead,
+ nulldev_write,nulldev_getstat,nulldev_setstat,nomap,
+ nodev_async_in, nulldev_reset, nulldev_portdeath,0,
+ nodev_info },
+
};
int dev_name_count = sizeof(dev_name_list)/sizeof(dev_name_list[0]);
diff --git a/i386/i386at/mbinfo.c b/i386/i386at/mbinfo.c
new file mode 100644
index 00000000..521119b8
--- /dev/null
+++ b/i386/i386at/mbinfo.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2024 Free Software Foundation, Inc.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <i386at/mbinfo.h>
+#include <mach/vm_param.h>
+#include <vm/pmap.h>
+#include <device/ds_routines.h>
+
+struct multiboot_raw_info mb_info;
+
+void
+mbinfo_register_boot_data(const struct multiboot_raw_info *mbi)
+{
+ mb_info = *mbi;
+}
+
+io_return_t
+mbinforead(dev_t dev, io_req_t ior)
+{
+ int err, count;
+
+ /* Check if IO_COUNT is valid */
+ if (ior->io_count != sizeof(struct multiboot_raw_info))
+ return D_INVALID_SIZE;
+
+ err = device_read_alloc(ior, (vm_size_t)ior->io_count);
+ if (err != KERN_SUCCESS)
+ return (err);
+
+ count = 0;
+ uint8_t *byte = (uint8_t *)&mb_info;
+ while (count < ior->io_count) {
+ *(uint8_t *)(&ior->io_data[count]) = *byte;
+ count++;
+ byte++;
+ }
+ ior->io_residual = ior->io_count - count;
+ return (D_SUCCESS);
+}
diff --git a/i386/i386at/mbinfo.h b/i386/i386at/mbinfo.h
new file mode 100644
index 00000000..0e623250
--- /dev/null
+++ b/i386/i386at/mbinfo.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2024 Free Software Foundation, Inc.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _I386AT_MBINFO_H_
+#define _I386AT_MBINFO_H_ 1
+
+#include <sys/types.h>
+
+#include <vm/vm_types.h>
+#include <mach/vm_prot.h>
+#include <device/device_types.h>
+#include <device/io_req.h>
+#include <mach/machine/multiboot.h>
+
+extern struct multiboot_raw_info mb_info;
+
+void mbinfo_register_boot_data(const struct multiboot_raw_info *mbi);
+
+io_return_t mbinforead(dev_t dev, io_req_t ior);
+
+#endif /* !_I386AT_MBINFO_H_ */
diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c
index a3e9b630..01489353 100644
--- a/i386/i386at/model_dep.c
+++ b/i386/i386at/model_dep.c
@@ -75,6 +75,7 @@
#include <i386at/int_init.h>
#include <i386at/kd.h>
#include <i386at/rtc.h>
+#include <i386at/mbinfo.h>
#include <i386at/model_dep.h>
#include <machine/irq.h>
@@ -354,6 +355,8 @@ register_boot_data(const struct multiboot_raw_info *mbi)
biosmem_register_boot_data(shdr->addr,
shdr->addr + shdr->size, FALSE);
}
}
+
+ mbinfo_register_boot_data(mbi);
}
#endif /* MACH_HYP */
--
2.45.2
