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| author | Jarkko Sakkinen <jarkko.sakkinen@intel.com> | 2012-05-08 21:22:46 +0300 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-05-08 15:04:27 -0700 |
| commit | cda846f101fb1396b6924f1d9b68ac3d42de5403 (patch) | |
| tree | 1fa8716c308b8e10156a1caf51d8ff6c98eceea9 /arch/x86/include/asm | |
| parent | bf8b88e97716feb750c3d34492f00d9c085e1183 (diff) | |
| download | linux-cda846f101fb1396b6924f1d9b68ac3d42de5403.tar.gz linux-cda846f101fb1396b6924f1d9b68ac3d42de5403.tar.xz linux-cda846f101fb1396b6924f1d9b68ac3d42de5403.zip | |
x86, realmode: read cr4 and EFER from kernel for 64-bit trampoline
This patch changes 64-bit trampoline so that CR4 and
EFER are provided by the kernel instead of using fixed
values.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-24-git-send-email-jarkko.sakkinen@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 7 | ||||
| -rw-r--r-- | arch/x86/include/asm/realmode.h | 8 |
2 files changed, 12 insertions, 3 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 4fa7dcceb6c0..404583ccf0cf 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -544,13 +544,16 @@ static inline void load_sp0(struct tss_struct *tss, * enable), so that any CPU's that boot up * after us can get the correct flags. */ -extern unsigned long mmu_cr4_features; +extern unsigned long mmu_cr4_features; +extern u32 *trampoline_cr4_features; static inline void set_in_cr4(unsigned long mask) { unsigned long cr4; mmu_cr4_features |= mask; + if (trampoline_cr4_features) + *trampoline_cr4_features = mmu_cr4_features; cr4 = read_cr4(); cr4 |= mask; write_cr4(cr4); @@ -561,6 +564,8 @@ static inline void clear_in_cr4(unsigned long mask) unsigned long cr4; mmu_cr4_features &= ~mask; + if (trampoline_cr4_features) + *trampoline_cr4_features = mmu_cr4_features; cr4 = read_cr4(); cr4 &= ~mask; write_cr4(cr4); diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h index 1421eed1c8e8..937dc6071d76 100644 --- a/arch/x86/include/asm/realmode.h +++ b/arch/x86/include/asm/realmode.h @@ -24,18 +24,22 @@ struct real_mode_header { #ifdef CONFIG_X86_32 u32 machine_real_restart_asm; #endif -} __attribute__((__packed__)); +}; /* This must match data at trampoline_32/64.S */ struct trampoline_header { #ifdef CONFIG_X86_32 u32 start; + u16 gdt_pad; u16 gdt_limit; u32 gdt_base; #else u64 start; + u32 cr4; + u32 efer_low; + u32 efer_high; #endif -} __attribute__((__packed__)); +}; extern struct real_mode_header *real_mode_header; extern unsigned char real_mode_blob_end[]; |