diff options
Diffstat (limited to 'arch/x86/include/asm/cpu.h')
| -rw-r--r-- | arch/x86/include/asm/cpu.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index 08284ee..c70183c 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -27,6 +27,24 @@ enum { X86_VENDOR_UNKNOWN = 0xff }; +/* Global descriptor table (GDT) bits */ +enum { + GDT_4KB = 1ULL << 55, + GDT_32BIT = 1ULL << 54, + GDT_LONG = 1ULL << 53, + GDT_PRESENT = 1ULL << 47, + GDT_NOTSYS = 1ULL << 44, + GDT_CODE = 1ULL << 43, + GDT_LIMIT_LOW_SHIFT = 0, + GDT_LIMIT_LOW_MASK = 0xffff, + GDT_LIMIT_HIGH_SHIFT = 48, + GDT_LIMIT_HIGH_MASK = 0xf, + GDT_BASE_LOW_SHIFT = 16, + GDT_BASE_LOW_MASK = 0xffff, + GDT_BASE_HIGH_SHIFT = 56, + GDT_BASE_HIGH_MASK = 0xf, +}; + struct cpuid_result { uint32_t eax; uint32_t ebx; @@ -212,6 +230,15 @@ char *cpu_get_name(char *name); void cpu_call64(ulong pgtable, ulong setup_base, ulong target); /** + * cpu_call32() - Jump to a 32-bit entry point + * + * @code_seg32: 32-bit code segment to use (GDT offset, e.g. 0x20) + * @target: Pointer to the start of the 32-bit U-Boot image/entry point + * @table: Pointer to start of info table to pass to U-Boot + */ +void cpu_call32(ulong code_seg32, ulong target, ulong table); + +/** * cpu_jump_to_64bit() - Jump to a 64-bit Linux kernel * * The kernel is uncompressed and the 64-bit entry point is expected to be |