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x86, realmode: Separate real_mode reserve and setup 

After we switch to use #PF handler help to set page table, init_level4_pgt
will only have entries set after init_mem_mapping().
We need to move copying init_level4_pgt to trampoline_pgd after that.

So split reserve and setup, and move the setup after init_mem_mapping()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-11-git-send-email-yinghai@kernel.org
Cc: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Acked-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2013-01-24 12:19:51 -08:00 committed by H. Peter Anvin
parent 9735e91e9c
commit 4f7b92263a
3 changed files with 25 additions and 14 deletions
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3
arch/x86/include/asm/realmode.h
View File

@ -58,6 +58,7 @@ extern unsigned char boot_gdt[];
extern unsigned char secondary_startup_64[];
#endif
extern void __init setup_real_mode(void);
void reserve_real_mode(void);
void setup_real_mode(void);
#endif /* _ARCH_X86_REALMODE_H */

4
arch/x86/kernel/setup.c
View File

@ -999,12 +999,14 @@ void __init setup_arch(char **cmdline_p)
printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
(max_pfn_mapped<<PAGE_SHIFT) - 1);
setup_real_mode();
reserve_real_mode();
trim_platform_memory_ranges();
init_mem_mapping();
setup_real_mode();
memblock.current_limit = get_max_mapped();
dma_contiguous_reserve(0);

32
arch/x86/realmode/init.c
View File

@ -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);
@ -84,7 +92,7 @@ void __init setup_real_mode(void)
}
/*
* setup_real_mode() gets called very early, to guarantee the
* 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. Also trampoline code will be executed by APs so we