summaryrefslogtreecommitdiff
path: root/arch/x86/realmode/init.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/realmode/init.c')
-rw-r--r--arch/x86/realmode/init.c49
1 files changed, 29 insertions, 20 deletions
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index cbca565af5bd..a44f457e70a1 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -8,9 +8,26 @@
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;
+ unsigned char *base;
+ size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob);
+
+ /* 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");
+
+ base = __va(mem);
+ memblock_reserve(mem, size);
+ 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;
u32 *rel;
u32 count;
@@ -25,16 +42,7 @@ void __init setup_real_mode(void)
u64 efer;
#endif
- /* Has to be in very low memory 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");
-
- base = __va(mem);
- memblock_reserve(mem, size);
- 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);
+ base = (unsigned char *)real_mode_header;
memcpy(base, real_mode_blob, size);
@@ -62,9 +70,9 @@ 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 +86,18 @@ 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 +121,4 @@ static int __init set_real_mode_permissions(void)
return 0;
}
-
-arch_initcall(set_real_mode_permissions);
+early_initcall(set_real_mode_permissions);