diff options
| author | Yinghai Lu <yinghai@kernel.org> | 2013-01-25 00:19:51 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2013-01-30 03:13:24 +0400 |
| commit | 4f7b92263ad68cdc72b11808320d9c881bfa857e (patch) | |
| tree | 6aeddf7284dec1acf7d7ad7296ab57d9ba80787c /arch/x86/realmode | |
| parent | 9735e91e9c29c0d8fe432aef1152e43e50bdb316 (diff) | |
| download | linux-4f7b92263ad68cdc72b11808320d9c881bfa857e.tar.xz | |
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>
Diffstat (limited to 'arch/x86/realmode')
| -rw-r--r-- | arch/x86/realmode/init.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index ffee06ac7de9..4b5bdc8c8710 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); @@ -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 |