more/xv6-public/mmu.h

27   uint lim_15_0 : 16;  // Low bits of segment limit
28   uint base_15_0 : 16; // Low bits of segment base address
29   uint base_23_16 : 8; // Middle bits of segment base address
30   uint type : 4;       // Segment type (see STS_ constants)
31   uint s : 1;          // 0 = system, 1 = application
32   uint dpl : 2;        // Descriptor Privilege Level
33   uint p : 1;          // Present
34   uint lim_19_16 : 4;  // High bits of segment limit
35   uint avl : 1;        // Unused (available for software use)
36   uint rsv1 : 1;       // Reserved
37   uint db : 1;         // 0 = 16-bit segment, 1 = 32-bit segment
38   uint g : 1;          // Granularity: limit scaled by 4K when set
39   uint base_31_24 : 8; // High bits of segment base address
44 { ((lim) >> 12) & 0xffff, (uint)(base) & 0xffff,      \
45   ((uint)(base) >> 16) & 0xff, type, 1, dpl, 1,       \
46   (uint)(lim) >> 28, 0, 0, 1, 1, (uint)(base) >> 24 }
48 { (lim) & 0xffff, (uint)(base) & 0xffff,              \
49   ((uint)(base) >> 16) & 0xff, type, 1, dpl, 1,       \
50   (uint)(lim) >> 16, 0, 0, 1, 0, (uint)(base) >> 24 }
74 #define PDX(va)         (((uint)(va) >> PDXSHIFT) & 0x3FF)
77 #define PTX(va)         (((uint)(va) >> PTXSHIFT) & 0x3FF)
80 #define PGADDR(d, t, o) ((uint)((d) << PDXSHIFT | (t) << PTXSHIFT | (o)))
100 #define PTE_ADDR(pte)   ((uint)(pte) & ~0xFFF)
101 #define PTE_FLAGS(pte)  ((uint)(pte) &  0xFFF)
104 typedef uint pte_t;
108   uint link;         // Old ts selector
109   uint esp0;         // Stack pointers and segment selectors
112   uint *esp1;
115   uint *esp2;
119   uint *eip;         // Saved state from last task switch
120   uint eflags;
121   uint eax;          // More saved state (registers)
122   uint ecx;
123   uint edx;
124   uint ebx;
125   uint *esp;
126   uint *ebp;
127   uint esi;
128   uint edi;
149   uint off_15_0 : 16;   // low 16 bits of offset in segment
150   uint cs : 16;         // code segment selector
151   uint args : 5;        // # args, 0 for interrupt/trap gates
152   uint rsv1 : 3;        // reserved(should be zero I guess)
153   uint type : 4;        // type(STS_{IG32,TG32})
154   uint s : 1;           // must be 0 (system)
155   uint dpl : 2;         // descriptor(meaning new) privilege level
156   uint p : 1;           // Present
157   uint off_31_16 : 16;  // high bits of offset in segment
170   (gate).off_15_0 = (uint)(off) & 0xffff;                \
178   (gate).off_31_16 = (uint)(off) >> 16;                  \