diff options
Diffstat (limited to 'mmu.h')
| -rw-r--r-- | mmu.h | 33 |
1 files changed, 14 insertions, 19 deletions
@@ -24,6 +24,20 @@ #define FL_VIP 0x00100000 // Virtual Interrupt Pending #define FL_ID 0x00200000 // ID flag +// Control Register flags +#define CR0_PE 0x00000001 // Protection Enable +#define CR0_MP 0x00000002 // Monitor coProcessor +#define CR0_EM 0x00000004 // Emulation +#define CR0_TS 0x00000008 // Task Switched +#define CR0_ET 0x00000010 // Extension Type +#define CR0_NE 0x00000020 // Numeric Errror +#define CR0_WP 0x00010000 // Write Protect +#define CR0_AM 0x00040000 // Alignment Mask +#define CR0_NW 0x20000000 // Not Writethrough +#define CR0_CD 0x40000000 // Cache Disable +#define CR0_PG 0x80000000 // Paging + +//PAGEBREAK! // Segment Descriptor struct segdesc { uint lim_15_0 : 16; // Low bits of segment limit @@ -46,7 +60,6 @@ struct segdesc { { ((lim) >> 12) & 0xffff, (uint)(base) & 0xffff, \ ((uint)(base) >> 16) & 0xff, type, 1, dpl, 1, \ (uint)(lim) >> 28, 0, 0, 1, 1, (uint)(base) >> 24 } - #define SEG16(type, base, lim, dpl) (struct segdesc) \ { (lim) & 0xffff, (uint)(base) & 0xffff, \ ((uint)(base) >> 16) & 0xff, type, 1, dpl, 1, \ @@ -62,8 +75,6 @@ struct segdesc { #define STA_R 0x2 // Readable (executable segments) #define STA_A 0x1 // Accessed -// - // System segment type bits #define STS_T16A 0x1 // Available 16-bit TSS #define STS_LDT 0x2 // Local Descriptor Table @@ -78,7 +89,6 @@ struct segdesc { #define STS_IG32 0xE // 32-bit Interrupt Gate #define STS_TG32 0xF // 32-bit Trap Gate - // A linear address 'la' has a three-part structure as follows: // // +--------10------+-------10-------+---------12----------+ @@ -130,21 +140,6 @@ struct segdesc { typedef uint pte_t; -// Control Register flags -#define CR0_PE 0x00000001 // Protection Enable -#define CR0_MP 0x00000002 // Monitor coProcessor -#define CR0_EM 0x00000004 // Emulation -#define CR0_TS 0x00000008 // Task Switched -#define CR0_ET 0x00000010 // Extension Type -#define CR0_NE 0x00000020 // Numeric Errror -#define CR0_WP 0x00010000 // Write Protect -#define CR0_AM 0x00040000 // Alignment Mask -#define CR0_NW 0x20000000 // Not Writethrough -#define CR0_CD 0x40000000 // Cache Disable -#define CR0_PG 0x80000000 // Paging - - -// PAGEBREAK: 40 // Task state segment format struct taskstate { uint link; // Old ts selector |