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-rw-r--r--arch/x86/realmode/init.c71
-rw-r--r--arch/x86/realmode/rm/Makefile19
-rw-r--r--arch/x86/realmode/rm/reboot.S1
-rw-r--r--arch/x86/realmode/rm/trampoline_32.S1
-rw-r--r--arch/x86/realmode/rm/trampoline_64.S1
5 files changed, 43 insertions, 50 deletions
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index cbca565af5b..bad628a620c 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -8,24 +8,13 @@
struct real_mode_header *real_mode_header;
u32 *trampoline_cr4_features;
-void __init setup_real_mode(void)
+void __init reserve_real_mode(void)
{
phys_addr_t mem;
- u16 real_mode_seg;
- u32 *rel;
- u32 count;
- u32 *ptr;
- u16 *seg;
- int i;
unsigned char *base;
- struct trampoline_header *trampoline_header;
size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob);
-#ifdef CONFIG_X86_64
- u64 *trampoline_pgd;
- u64 efer;
-#endif
- /* Has to be in very low memory so we can execute real-mode AP code. */
+ /* Has to be under 1M so we can execute real-mode AP code. */
mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE);
if (!mem)
panic("Cannot allocate trampoline\n");
@@ -35,26 +24,43 @@ void __init setup_real_mode(void)
real_mode_header = (struct real_mode_header *) base;
printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
base, (unsigned long long)mem, size);
+}
+
+void __init setup_real_mode(void)
+{
+ u16 real_mode_seg;
+ const u32 *rel;
+ u32 count;
+ unsigned char *base;
+ unsigned long phys_base;
+ struct trampoline_header *trampoline_header;
+ size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob);
+#ifdef CONFIG_X86_64
+ u64 *trampoline_pgd;
+ u64 efer;
+#endif
+
+ base = (unsigned char *)real_mode_header;
memcpy(base, real_mode_blob, size);
- real_mode_seg = __pa(base) >> 4;
+ phys_base = __pa(base);
+ real_mode_seg = phys_base >> 4;
+
rel = (u32 *) real_mode_relocs;
/* 16-bit segment relocations. */
- count = rel[0];
- rel = &rel[1];
- for (i = 0; i < count; i++) {
- seg = (u16 *) (base + rel[i]);
+ count = *rel++;
+ while (count--) {
+ u16 *seg = (u16 *) (base + *rel++);
*seg = real_mode_seg;
}
/* 32-bit linear relocations. */
- count = rel[i];
- rel = &rel[i + 1];
- for (i = 0; i < count; i++) {
- ptr = (u32 *) (base + rel[i]);
- *ptr += __pa(base);
+ count = *rel++;
+ while (count--) {
+ u32 *ptr = (u32 *) (base + *rel++);
+ *ptr += phys_base;
}
/* Must be perfomed *after* relocation. */
@@ -62,9 +68,9 @@ void __init setup_real_mode(void)
__va(real_mode_header->trampoline_header);
#ifdef CONFIG_X86_32
- trampoline_header->start = __pa(startup_32_smp);
+ trampoline_header->start = __pa_symbol(startup_32_smp);
trampoline_header->gdt_limit = __BOOT_DS + 7;
- trampoline_header->gdt_base = __pa(boot_gdt);
+ trampoline_header->gdt_base = __pa_symbol(boot_gdt);
#else
/*
* Some AMD processors will #GP(0) if EFER.LMA is set in WRMSR
@@ -78,16 +84,18 @@ void __init setup_real_mode(void)
*trampoline_cr4_features = read_cr4();
trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd);
- trampoline_pgd[0] = __pa(level3_ident_pgt) + _KERNPG_TABLE;
- trampoline_pgd[511] = __pa(level3_kernel_pgt) + _KERNPG_TABLE;
+ trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;
+ trampoline_pgd[511] = init_level4_pgt[511].pgd;
#endif
}
/*
- * set_real_mode_permissions() gets called very early, to guarantee the
- * availability of low memory. This is before the proper kernel page
+ * reserve_real_mode() gets called very early, to guarantee the
+ * availability of low memory. This is before the proper kernel page
* tables are set up, so we cannot set page permissions in that
- * function. Thus, we use an arch_initcall instead.
+ * function. Also trampoline code will be executed by APs so we
+ * need to mark it executable at do_pre_smp_initcalls() at least,
+ * thus run it as a early_initcall().
*/
static int __init set_real_mode_permissions(void)
{
@@ -111,5 +119,4 @@ static int __init set_real_mode_permissions(void)
return 0;
}
-
-arch_initcall(set_real_mode_permissions);
+early_initcall(set_real_mode_permissions);
diff --git a/arch/x86/realmode/rm/Makefile b/arch/x86/realmode/rm/Makefile
index 88692871823..7c0d7be176a 100644
--- a/arch/x86/realmode/rm/Makefile
+++ b/arch/x86/realmode/rm/Makefile
@@ -52,8 +52,9 @@ $(obj)/realmode.elf: $(obj)/realmode.lds $(REALMODE_OBJS) FORCE
OBJCOPYFLAGS_realmode.bin := -O binary
targets += realmode.bin
-$(obj)/realmode.bin: $(obj)/realmode.elf $(obj)/realmode.relocs
+$(obj)/realmode.bin: $(obj)/realmode.elf $(obj)/realmode.relocs FORCE
$(call if_changed,objcopy)
+ @:
quiet_cmd_relocs = RELOCS $@
cmd_relocs = arch/x86/tools/relocs --realmode $< > $@
@@ -64,19 +65,7 @@ $(obj)/realmode.relocs: $(obj)/realmode.elf FORCE
# ---------------------------------------------------------------------------
-# How to compile the 16-bit code. Note we always compile for -march=i386,
-# that way we can complain to the user if the CPU is insufficient.
-KBUILD_CFLAGS := $(LINUXINCLUDE) -m32 -g -Os -D_SETUP -D__KERNEL__ -D_WAKEUP \
- -I$(srctree)/arch/x86/boot \
- -DDISABLE_BRANCH_PROFILING \
- -Wall -Wstrict-prototypes \
- -march=i386 -mregparm=3 \
- -include $(srctree)/$(src)/../../boot/code16gcc.h \
- -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
- $(call cc-option, -ffreestanding) \
- $(call cc-option, -fno-toplevel-reorder,\
- $(call cc-option, -fno-unit-at-a-time)) \
- $(call cc-option, -fno-stack-protector) \
- $(call cc-option, -mpreferred-stack-boundary=2)
+KBUILD_CFLAGS := $(LINUXINCLUDE) $(REALMODE_CFLAGS) -D_SETUP -D_WAKEUP \
+ -I$(srctree)/arch/x86/boot
KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
GCOV_PROFILE := n
diff --git a/arch/x86/realmode/rm/reboot.S b/arch/x86/realmode/rm/reboot.S
index f932ea61d1c..d66c607bdc5 100644
--- a/arch/x86/realmode/rm/reboot.S
+++ b/arch/x86/realmode/rm/reboot.S
@@ -1,5 +1,4 @@
#include <linux/linkage.h>
-#include <linux/init.h>
#include <asm/segment.h>
#include <asm/page_types.h>
#include <asm/processor-flags.h>
diff --git a/arch/x86/realmode/rm/trampoline_32.S b/arch/x86/realmode/rm/trampoline_32.S
index c1b2791183e..48ddd76bc4c 100644
--- a/arch/x86/realmode/rm/trampoline_32.S
+++ b/arch/x86/realmode/rm/trampoline_32.S
@@ -20,7 +20,6 @@
*/
#include <linux/linkage.h>
-#include <linux/init.h>
#include <asm/segment.h>
#include <asm/page_types.h>
#include "realmode.h"
diff --git a/arch/x86/realmode/rm/trampoline_64.S b/arch/x86/realmode/rm/trampoline_64.S
index bb360dc39d2..dac7b20d2f9 100644
--- a/arch/x86/realmode/rm/trampoline_64.S
+++ b/arch/x86/realmode/rm/trampoline_64.S
@@ -25,7 +25,6 @@
*/
#include <linux/linkage.h>
-#include <linux/init.h>
#include <asm/pgtable_types.h>
#include <asm/page_types.h>
#include <asm/msr.h>
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 22:04:22 +0000