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x86: add comments to processor.h

add comments to the FPU structures of processor.h.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-03-05 15:15:42 +01:00
parent e104383fbf
commit ca9cda2f7b
1 changed files with 28 additions and 23 deletions

View File

@ -289,42 +289,47 @@ struct orig_ist {
#define MXCSR_DEFAULT 0x1f80 #define MXCSR_DEFAULT 0x1f80
struct i387_fsave_struct { struct i387_fsave_struct {
u32 cwd; u32 cwd; /* FPU Control Word */
u32 swd; u32 swd; /* FPU Status Word */
u32 twd; u32 twd; /* FPU Tag Word */
u32 fip; u32 fip; /* FPU IP Offset */
u32 fcs; u32 fcs; /* FPU IP Selector */
u32 foo; u32 foo; /* FPU Operand Pointer Offset */
u32 fos; u32 fos; /* FPU Operand Pointer Selector */
/* 8*10 bytes for each FP-reg = 80 bytes: */
/* 8*10 bytes for each FP-reg = 80 bytes: */
u32 st_space[20]; u32 st_space[20];
/* Software status information: */
/* Software status information [not touched by FSAVE ]: */
u32 status; u32 status;
}; };
struct i387_fxsave_struct { struct i387_fxsave_struct {
u16 cwd; u16 cwd; /* Control Word */
u16 swd; u16 swd; /* Status Word */
u16 twd; u16 twd; /* Tag Word */
u16 fop; u16 fop; /* Last Instruction Opcode */
union { union {
struct { struct {
u64 rip; u64 rip; /* Instruction Pointer */
u64 rdp; u64 rdp; /* Data Pointer */
}; };
struct { struct {
u32 fip; u32 fip; /* FPU IP Offset */
u32 fcs; u32 fcs; /* FPU IP Selector */
u32 foo; u32 foo; /* FPU Operand Offset */
u32 fos; u32 fos; /* FPU Operand Selector */
}; };
}; };
u32 mxcsr; u32 mxcsr; /* MXCSR Register State */
u32 mxcsr_mask; u32 mxcsr_mask; /* MXCSR Mask */
/* 8*16 bytes for each FP-reg = 128 bytes: */
/* 8*16 bytes for each FP-reg = 128 bytes: */
u32 st_space[32]; u32 st_space[32];
/* 16*16 bytes for each XMM-reg = 256 bytes: */
/* 16*16 bytes for each XMM-reg = 256 bytes: */
u32 xmm_space[64]; u32 xmm_space[64];
u32 padding[24]; u32 padding[24];
} __attribute__((aligned(16))); } __attribute__((aligned(16)));