| #pragma once |
| |
| #ifndef ROS_INC_ARCH_MMU_H |
| #error "Do not include include ros/arch/mmu64.h directly" |
| #endif |
| |
| #ifndef __ASSEMBLER__ |
| #include <ros/common.h> |
| typedef unsigned long kpte_t; |
| typedef unsigned long epte_t; |
| |
| typedef kpte_t* pte_t; |
| |
| typedef struct x86_pgdir { |
| kpte_t *kpte; |
| uint64_t eptp; |
| } pgdir_t; |
| #endif |
| |
| /* Virtual memory map: Virt Addresses |
| * perms: kernel/user |
| * |
| * +------------------------------+ 0xffffffffffffffff -+ |
| * | | | |
| * | Mapped to lowmem, unused | RW/-- | |
| * | | | |
| * "end" symbol --> +------------------------------+ PML3_PTE_REACH |
| * | | | |
| * | Kernel link/load location | | |
| * | (mapped to 0, physical) | | |
| * | | | |
| * KERN_LOAD_ADDR --> +------------------------------+ 0xffffffffc0000000 -+ |
| * | | |
| * | IOAPIC | RW/-- APIC_SIZE (1MB) |
| * | | |
| * IOAPIC_BASE --> +------------------------------+ 0xffffffffbff00000 |
| * : : |
| * | Unmapped | --/-- |
| * | | |
| * | Kernel static linking limit | |
| * KERN_DYN_TOP --> +------------------------------+ 0xffffffff80000000 |
| * | Kernel Dynamic Mappings | |
| * | . | |
| * : . : |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ RW/-- |
| * | . | |
| * | . | |
| * | . | |
| * KERN_DYN_BOT --> +------------------------------+ 0xfffffff000000000 |
| * | | |
| * | | |
| * | | |
| * VPT_TOP -----> +------------------------------+ 0xffffff0000000000 -+ |
| * | | | |
| * | | | |
| * | Cur. Page Table (Kern. RW) | RW/-- P4ML_PTE_REACH |
| * | | | |
| * | | | |
| * VPT, -----> +------------------------------+ 0xfffffe8000000000 -+ |
| * KERN_VMAP_TOP | | |
| * : . : |
| * : . : |
| * : . : |
| * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| RW/-- |
| * | | RW/-- |
| * | | RW/-- |
| * | | RW/-- |
| * | Remapped Physical Memory | RW/-- |
| * | | RW/-- |
| * | | RW/-- |
| * | | RW/-- |
| * KERNBASE ----> +------------------------------+ 0xffff800000000000 |
| * | | |
| * | | |
| * | | |
| * | Non-canonical addresses | |
| * | (unusable) | |
| * | | |
| * | | |
| * ULIM (not canon) -> +------------------------------+ 0x0000800000000000 -+ |
| * + Highest user address + 0x00007fffffffffff | |
| * | | | |
| * | Cur. Page Table (User R-) | R-/R- PML4_PTE_REACH |
| * | | | |
| * UVPT ----> +------------------------------+ 0x00007f8000000000 -+ |
| * | Unmapped (expandable region) | | |
| * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| | |
| * | Global R/O Info | R-/R- PML2_PTE_REACH |
| * | (proc_glb_info) | | |
| * UGINFO ----> +------------------------------+ 0x00007f7fffe00000 -+ |
| * | Unmapped (expandable region) | | |
| * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| | |
| * | Per-Process R/O Info | R-/R- PML2_PTE_REACH |
| * | (procinfo) | | |
| * UWLIM, UINFO ----> +------------------------------+ 0x00007f7fffc00000 -+ |
| * | Unmapped (expandable region) | | |
| * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| | |
| * | Per-Process R/W Data | RW/RW PML2_PTE_REACH |
| * | (procdata) | | |
| * UDATA ----> +------------------------------+ 0x00007f7fffa00000 -+ |
| * | | |
| * | Global Shared R/W Data | RW/RW PGSIZE |
| * | | |
| * UMAPTOP, UGDATA -> +------------------------------+ 0x00007f7fff9ff000 |
| * USTACKTOP | | |
| * | Normal User Stack | RW/RW 256 * PGSIZE |
| * | | |
| * +------------------------------+ 0x00007f7fff8ff000 |
| * | | |
| * | Empty Memory | |
| * | | |
| * . . |
| * . . |
| * BRK_END ----> +------------------------------+ 0x0000300000000000 |
| * . . |
| * . . |
| * | | |
| * | SBRK Heap | |
| * | | |
| * BRK_START ----> +------------------------------+ 0x0000100000000000 |
| * . . |
| * . . |
| * | | |
| * | Empty Memory | |
| * | | |
| * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| |
| * | | |
| * | Program, BSS, & Data | |
| * | | |
| * +------------------------------+ 0x0000000000400000 |
| * . . |
| * . . |
| * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| |
| * | | |
| * | ld.so (Dynamic) | |
| * | | |
| * MMAP_LD_FIXED_VA +------------------------------+ 0x0000000000100000 |
| * | | |
| * | | |
| * | | |
| * MMAP_LOWEST_VA +------------------------------+ 0x0000000000001000 |
| * | | |
| * | Empty Memory (*) | |
| * | | |
| * +------------------------------+ 0x0000000000000000 |
| */ |
| |
| /* Physical Mapping symbols: |
| * At IOPHYSMEM (640K) there is a 384K hole for I/O. From the kernel, |
| * IOPHYSMEM can be addressed at KERNBASE + IOPHYSMEM. The hole ends |
| * at physical address EXTPHYSMEM. */ |
| #define IOPHYSMEM 0x0A0000 |
| #define VGAPHYSMEM 0x0A0000 |
| #define DEVPHYSMEM 0x0C0000 |
| #define BIOSPHYSMEM 0x0F0000 |
| #define EXTPHYSMEM 0x100000 |
| |
| /* Kernel Virtual Memory Mapping */ |
| |
| /* The kernel needs to be loaded in the top 2 GB of memory, since we compile it |
| * with -mcmodel=kernel (helps with relocations). We're actually loading it in |
| * the top 1 GB. */ |
| #define KERN_LOAD_ADDR 0xffffffffc0000000 |
| /* Static kernel mappings */ |
| #define APIC_SIZE 0x100000 |
| #define IOAPIC_BASE (KERN_LOAD_ADDR - APIC_SIZE) |
| /* This is the range of the dynamic virtual mappings. */ |
| #define KERN_DYN_TOP 0xffffffff80000000 |
| #define KERN_DYN_BOT 0xfffffff000000000 |
| |
| /* Virtual page table. Every PML4 has a PTE at the slot (PML4(VPT)) |
| * corresponding to VPT that points to that PML4's base. In essence, the 512 |
| * GB chunk of the VA space from VPT..VPT_TOP is a window into the paging |
| * structure. |
| * |
| * The VPT needs to be aligned on 39 bits. |
| * |
| * Ex: Say the VPT's entry in 9 bits is "9v". If you construct a VA from: |
| * 9v9v9v9v000, the paging hardware will recurse 4 times, with the end result |
| * being the PML4. That virtual address will map to the PML4 itself. |
| * |
| * If you want to see a specific PML3, figure out which entry it is in the |
| * PML4 (using PML3(va)), say 9 bits = "9X". The VA 9v9v9v9X000 will map to |
| * that PML3. */ |
| #define VPT_TOP 0xffffff0000000000 |
| #define VPT (VPT_TOP - PML4_PTE_REACH) |
| /* Helper to return the current outer pgdir via the VPT mapping. */ |
| #define PML4_VIA_VPT (VPT + ((VPT & 0x0000ffffffffffff) >> 9) + \ |
| ((VPT & 0x0000ffffffffffff) >> 18) + \ |
| ((VPT & 0x0000ffffffffffff) >> 27)) |
| |
| /* Top of the kernel virtual mapping area (KERNBASE) */ |
| #define KERN_VMAP_TOP (VPT) |
| /* Base of the physical memory map. This maps from 0 physical to max_paddr */ |
| #define KERNBASE 0xffff800000000000 |
| |
| /* Highest user address: 0x00007fffffffffff: 1 zero, 47 ones, sign extended. |
| * From here down to UWLIM is User Read-only */ |
| #define ULIM 0x0000800000000000 |
| /* Same as VPT but read-only for users */ |
| #define UVPT (ULIM - PML4_PTE_REACH) |
| /* Arbitrary boundary between the break and the start of |
| * memory returned by calls to mmap with addr = 0 */ |
| #define BRK_END 0x0000300000000000 |
| /* Arbitrary boundary where the break (glibc's heap) starts. You can safely |
| * mmap with MAP_FIXED below this address. */ |
| #define BRK_START 0x0000100000000000 |
| |
| /* **************************************** */ |
| /* Page table constants, macros, etc */ |
| |
| /* A linear address 'la' has a five-part structure as follows: |
| * |
| * +-----9------+-----9------+-----9------+-----9------+---------12----------+ |
| * | PML4 bits | PML3 bits | PML2 bits | PML1 bits | Page offset | |
| * | offset | offset | offset | offset | | |
| * +------------+------------+------------+------------+---------------------+ |
| * \ PML4(la) / \ PML3(la) / \ PML2(la) / \ PML1(la) / \---- PGOFF(la) ----/ |
| * \------------------ LA2PPN(la) -------------------/ |
| * |
| * The PMLx, PGOFF, and LA2PPN macros decompose linear addresses as shown. |
| * To construct a linear address la from these, use: |
| * PGADDR(PML4(la), PML3(la), PML2(la), PML1(la), PGOFF(la)). |
| * Careful, that's arch- and bit-specific. |
| * |
| * I'd somewhat like it if we started counting from the outer-most PT, though |
| * amd coined the term PML4 for the outermost, instead of PML1. Incidentally, |
| * they also don't use numbers other than PML4, sticking with names like PDP. */ |
| |
| #define PML4_SHIFT 39 |
| #define PML3_SHIFT 30 |
| #define PML2_SHIFT 21 |
| #define PML1_SHIFT 12 |
| #define BITS_PER_PML 9 |
| |
| /* PTE reach is the amount of VM an entry can map, either as a jumbo or as |
| * further page tables. I'd like to write these as shifts, but I can't please |
| * both the compiler and the assembler. */ |
| #define PML4_PTE_REACH (0x0000008000000000) /* No jumbos available */ |
| #define PML3_PTE_REACH (0x0000000040000000) /* 1 GB jumbos available */ |
| #define PML2_PTE_REACH (0x0000000000200000) /* 2 MB jumbos available */ |
| #define PML1_PTE_REACH (0x0000000000001000) /* aka, PGSIZE */ |
| |
| /* Reach is the amount of VM a table can map, counting all of its entries. |
| * Note that a PML(n)_PTE is a PML(n-1) table. */ |
| #define PML4_REACH (512ULL * PML4_PTE_REACH) |
| #define PML3_REACH (PML4_PTE_REACH) |
| #define PML2_REACH (PML3_PTE_REACH) |
| #define PML1_REACH (PML2_PTE_REACH) |
| |
| /* PMLx(la, shift) gives the 9 bits specifying the la's entry in the PML |
| * corresponding to shift. PMLn(la) gives the 9 bits for PML4, etc. */ |
| #define PMLx(la, shift) (((uintptr_t)(la) >> (shift)) & 0x1ff) |
| #define PML4(la) PMLx(la, PML4_SHIFT) |
| #define PML3(la) PMLx(la, PML3_SHIFT) |
| #define PML2(la) PMLx(la, PML2_SHIFT) |
| #define PML1(la) PMLx(la, PML1_SHIFT) |
| |
| /* Common kernel helpers */ |
| #define PGSHIFT PML1_SHIFT |
| #define PGSIZE PML1_PTE_REACH |
| #define LA2PPN(la) ((uintptr_t)(la) >> PGSHIFT) |
| #define PTE2PPN(pte) LA2PPN(pte) |
| #define PGOFF(la) ((uintptr_t)(la) & (PGSIZE - 1)) |
| #define NPTENTRIES 512 |
| |
| /* This is used in places (procinfo) meaning "size of smallest jumbo page" */ |
| #define PTSIZE PML2_PTE_REACH |
| |
| /* Page table/directory entry flags. */ |
| |
| /* Some things to be careful of: Global and PAT only apply to the last PTE in |
| * a chain: so either a PTE in PML1, or a Jumbo PTE in PML2 or 3. When PAT |
| * applies, which bit we use depends on whether we are jumbo or not. For PML1, |
| * PAT is bit 7. For jumbo PTEs (and only when they are for a jumbo page), we |
| * use bit 12. */ |
| #define PTE_P (1 << 0) /* Present */ |
| #define PTE_W (1 << 1) /* Writeable */ |
| #define PTE_U (1 << 2) /* User */ |
| #define __PTE_PWT (1 << 3) /* Write-Through */ |
| #define __PTE_PCD (1 << 4) /* Cache-Disable */ |
| #define PTE_A (1 << 5) /* Accessed */ |
| #define PTE_D (1 << 6) /* Dirty */ |
| #define PTE_PS (1 << 7) /* Page Size */ |
| #define __PTE_PAT (1 << 7) /* Page attribute table */ |
| #define PTE_G (1 << 8) /* Global Page */ |
| #define __PTE_JPAT (1 << 12) /* Jumbo PAT */ |
| #define PTE_XD (1 << 63) /* Execute disabled */ |
| #define PTE_NOCACHE (__PTE_PWT | __PTE_PCD) |
| #define PTE_WRITECOMB (__PTE_PCD) |
| |
| /* Permissions fields and common access modes. These should be read as 'just |
| * kernel or user too' and 'RO or RW'. USER_RO means read-only for everyone. */ |
| #define PTE_PERM (PTE_W | PTE_U | PTE_P) |
| #define PTE_KERN_RW (PTE_W | PTE_P) |
| #define PTE_KERN_RO PTE_P |
| #define PTE_USER_RW (PTE_W | PTE_U | PTE_P) |
| #define PTE_USER_RO (PTE_U | PTE_P) |
| #define PTE_NONE 0 |
| |
| /* The PTE/translation part of a PTE/virtual(linear) address. It's used |
| * frequently to be the page address of a virtual address. Note this doesn't |
| * work on jumbo PTEs due to the reserved bits. Jumbo's don't have a PTE_ADDR |
| * in them - just a base address of wherever they point. */ |
| #define PTE_ADDR(pte) ((physaddr_t) (pte) & ~(PGSIZE - 1)) |
| /* More meaningful macro, same as PTE_ADDR */ |
| #define PG_ADDR(la) ((uintptr_t)(la) & ~(PGSIZE - 1)) |
| |
| /* we must guarantee that for any PTE, exactly one of the following is true */ |
| #define PAGE_PRESENT(pte) ((pte) & PTE_P) |
| #define PAGE_UNMAPPED(pte) ((pte) == 0) |
| #define PAGE_PAGED_OUT(pte) (0) /* Need to use an OS reserved PTE bit */ |
| |
| |
| /* **************************************** */ |
| /* Segmentation */ |
| |
| /* Global descriptor numbers */ |
| #define GD_NULL 0x00 /* NULL descriptor */ |
| #define GD_KT 0x08 /* kernel text */ |
| #define GD_KD 0x10 /* kernel data */ |
| /* syscall/sysret wants UD before UT, but KT before KD. it really wants UT32, |
| * UD, UT64. anyways... */ |
| #define GD_UD 0x18 /* user data */ |
| #define GD_UT 0x20 /* user text */ |
| #define GD_TSS 0x28 /* Task segment selector */ |
| #define GD_TSS2 0x30 /* Placeholder, TSS is 2-descriptors wide */ |
| /* These two aren't in the GDT yet (might never be) */ |
| #define GD_LDT 0x38 /* Local descriptor table */ |
| #define GD_LDT2 0x40 /* Placeholder */ |
| |
| #ifdef __ASSEMBLER__ |
| |
| /* Macros to build GDT entries in assembly. */ |
| #define SEG_NULL \ |
| .word 0, 0; \ |
| .byte 0, 0, 0, 0 |
| |
| /* 64 bit code segment. This is for long mode, no compatibility. If we want |
| * to support 32 bit apps later, we'll want to adjust this. */ |
| #define SEG_CODE_64(dpl) \ |
| .word 0, 0; \ |
| .byte 0; \ |
| .byte (((1/*p*/) << 7) | ((dpl) << 5) | 0x18 | ((0/*c*/) << 2)); \ |
| .byte (((0/*d*/) << 6) | ((1/*l*/) << 5)); \ |
| .byte 0; |
| |
| /* 64 bit data segment. These are pretty much completely ignored (except if we |
| * use them for fs/gs, or compatibility mode */ |
| #define SEG_DATA_64(dpl) \ |
| .word 0xffff, 0; \ |
| .byte 0; \ |
| .byte (0x92 | ((dpl) << 5)); \ |
| .byte 0x8f; \ |
| .byte 0; |
| |
| /* System segments (TSS/LDT) are twice as long as usual (16 bytes). */ |
| #define SEG_SYS_64(type, base, lim, dpl) \ |
| .word ((lim) & 0xffff); \ |
| .word ((base) & 0xffff); \ |
| .byte (((base) >> 16) & 0xff); \ |
| .byte ((1 << 7) | ((dpl) << 5) | (type)); \ |
| .byte (((1/*g*/) << 7) | (((lim) >> 16) & 0xf)); \ |
| .byte (((base) >> 24) & 0xff); \ |
| .quad ((base) >> 32); \ |
| .quad 0; |
| |
| /* Default segment (32 bit style). Would work for fs/gs, if needed */ |
| #define SEG(type, base, lim) \ |
| .word (((lim) >> 12) & 0xffff); \ |
| .word ((base) & 0xffff); \ |
| .byte (((base) >> 16) & 0xff); \ |
| .byte (0x90 | (type)); \ |
| .byte (0xC0 | (((lim) >> 28) & 0xf)); \ |
| .byte (((base) >> 24) & 0xff) |
| |
| #else // not __ASSEMBLER__ |
| |
| /* Legacy Segment Descriptor (used for 64 bit data and code) */ |
| typedef struct Segdesc { |
| unsigned sd_lim_15_0 : 16; // Low bits of segment limit |
| unsigned sd_base_15_0 : 16; // Low bits of segment base address |
| unsigned sd_base_23_16 : 8; // Middle bits of segment base address |
| unsigned sd_type : 4; // Segment type (see STS_ constants) |
| unsigned sd_s : 1; // 0 = system, 1 = application |
| unsigned sd_dpl : 2; // Descriptor Privilege Level |
| unsigned sd_p : 1; // Present |
| unsigned sd_lim_19_16 : 4; // High bits of segment limit |
| unsigned sd_avl : 1; // Unused (available for software use) |
| unsigned sd_rsv1 : 1; // Reserved |
| unsigned sd_db : 1; // 0 = 16-bit segment, 1 = 32-bit segment |
| unsigned sd_g : 1; // Granularity: limit scaled by 4K when set |
| unsigned sd_base_31_24 : 8; // High bits of segment base address |
| } segdesc_t; |
| |
| /* Lower half is similar (more ignored, etc) to a legacy system descriptor */ |
| struct x86_sysseg64 { |
| unsigned sd_lim_15_0 : 16; /* Low bits of segment limit */ |
| unsigned sd_base_15_0 : 16; /* Low bits of segment base address */ |
| unsigned sd_base_23_16 : 8; /* Middle bits of segment base address */ |
| unsigned sd_type : 4; /* Segment type (see STS_ constants) */ |
| unsigned sd_s : 1; /* 0 = system, 1 = application */ |
| unsigned sd_dpl : 2; /* Descriptor Privilege Level */ |
| unsigned sd_p : 1; /* Present */ |
| unsigned sd_lim_19_16 : 4; /* High bits of segment limit */ |
| unsigned sd_avl : 1; /* Unused (available for software ) */ |
| unsigned sd_rsv2 : 2; /* Reserved */ |
| unsigned sd_g : 1; /* Granularity: limit scaled by 4K when set */ |
| unsigned sd_base_31_24 : 8; /* 24-31 bits of segment base address */ |
| unsigned sd_base_63_32; /* top 32 bits of the base */ |
| unsigned sd_reserved; /* some parts must be zero, just zero it all */ |
| }; |
| typedef struct x86_sysseg64 syssegdesc_t; |
| |
| /* G(ranularity) determines if the limit is shifted */ |
| #define __SEG_SYS64(type, base, lim, dpl, g) \ |
| { ((lim) >> ((g) * 12)) & 0xffff, (base) & 0xffff, ((base) >> 16) & 0xff, \ |
| type, 0, dpl, 1, (unsigned) (lim) >> 28, 0, 0, (g), \ |
| ((unsigned) (base) >> 24) & 0xff, \ |
| ((unsigned long) (base) >> 32), 0 } |
| |
| /* Normal system segment descriptor (LDT or TSS). (limit is scaled by 4k) */ |
| #define SEG_SYS64(type, base, lim, dpl) \ |
| __SEG_SYS64(type, base, lim, dpl, 1) |
| |
| /* Smaller system segment descriptor (LDT or TSS). */ |
| #define SEG_SYS64_SMALL(type, base, lim, dpl) \ |
| __SEG_SYS64(type, base, lim, dpl, 0) |
| |
| #define SEG_SYS_SMALL(type, base, lim, dpl) \ |
| SEG_SYS64_SMALL(type, base, lim, dpl) |
| |
| /* 64 bit task state segment (AMD 2:12.2.5) */ |
| typedef struct taskstate { |
| uint32_t ts_rsv1; /* reserved / ignored */ |
| uint64_t ts_rsp0; /* stack ptr in ring 0 */ |
| uint64_t ts_rsp1; /* stack ptr in ring 1 */ |
| uint64_t ts_rsp2; /* stack ptr in ring 2 */ |
| uint64_t ts_rsv2; /* reserved / ignored */ |
| uint64_t ts_ist1; /* IST: unconditional rsp */ |
| uint64_t ts_ist2; /* check AMD 2:8.9.4 for info */ |
| uint64_t ts_ist3; |
| uint64_t ts_ist4; |
| uint64_t ts_ist5; |
| uint64_t ts_ist6; |
| uint64_t ts_ist7; |
| uint64_t ts_rsv3; /* reserved / ignored */ |
| uint16_t ts_rsv4; /* reserved / ignored */ |
| uint16_t ts_iobm; /* IO base map (offset) */ |
| } __attribute__((packed)) taskstate_t; |
| |
| /* 64 bit gate descriptors for interrupts and traps */ |
| typedef struct Gatedesc { |
| unsigned gd_off_15_0 : 16; /* low 16 bits of offset in segment */ |
| unsigned gd_ss : 16; /* segment selector */ |
| unsigned gd_ist : 3; /* interrupt stack table selector (0 = none) */ |
| unsigned gd_rsv1 : 5; /* ignored */ |
| unsigned gd_type : 4; /* type(STS_{TG,IG32,TG32}) */ |
| unsigned gd_s : 1; /* must be 0 (system) */ |
| unsigned gd_dpl : 2; /* DPL - highest ring allowed to use this */ |
| unsigned gd_p : 1; /* Present */ |
| unsigned gd_off_31_16 : 16; /* 16-31 bits of offset in segment */ |
| unsigned gd_off_63_32; /* top 32 bits of offset */ |
| unsigned gd_rsv2; /* reserved / unsused */ |
| } gatedesc_t; |
| |
| /* Set up an IST-capable 64 bit interrupt/trap gate descriptor. IST selects a |
| * stack pointer from the interrupt-stack table (in TSS) that will be loaded |
| * unconditionally when we hit this gate - regardless of privelege change. */ |
| #define SETGATE64(gate, istrap, sel, off, dpl, ist) \ |
| { \ |
| (gate).gd_off_15_0 = (uintptr_t) (off) & 0xffff; \ |
| (gate).gd_ss = (sel); \ |
| (gate).gd_ist = (ist); \ |
| (gate).gd_rsv1 = 0; \ |
| (gate).gd_type = (istrap) ? STS_TG32 : STS_IG32; \ |
| (gate).gd_s = 0; \ |
| (gate).gd_dpl = (dpl); \ |
| (gate).gd_p = 1; \ |
| (gate).gd_off_31_16 = (uintptr_t) (off) >> 16; \ |
| (gate).gd_off_63_32 = (uintptr_t) (off) >> 32; \ |
| (gate).gd_rsv2 = 0; \ |
| } |
| |
| /* Set up a normal, 64 bit interrupt/trap gate descriptor. |
| * - istrap: 1 for a trap (= exception) gate, 0 for an interrupt gate. |
| * - interrupt gates automatically disable interrupts (cli) |
| * - sel: Code segment selector for interrupt/trap handler |
| * - off: Offset in code segment for interrupt/trap handler (address) |
| * - dpl: Descriptor Privilege Level - |
| * the privilege level required for software to invoke |
| * this interrupt/trap gate explicitly using an int instruction. */ |
| #define SETGATE(gate, istrap, sel, off, dpl) \ |
| SETGATE64(gate, istrap, sel, off, dpl, 0) |
| |
| // Pseudo-descriptors used for LGDT, LLDT and LIDT instructions. |
| typedef struct Pseudodesc { |
| uint16_t pd_lim; // Limit |
| uintptr_t pd_base; // Base address |
| } __attribute__ ((packed)) pseudodesc_t; |
| |
| #endif /* !__ASSEMBLER__ */ |
| |
| // Application segment type bits |
| #define STA_X 0x8 // Executable segment |
| #define STA_E 0x4 // Expand down (non-executable segments) |
| #define STA_C 0x4 // Conforming code segment (executable only) |
| #define STA_W 0x2 // Writeable (non-executable segments) |
| #define STA_R 0x2 // Readable (executable segments) |
| #define STA_A 0x1 // Accessed |
| |
| /* System segment type bits. All other types are reserved/illegal. The '32' is |
| * mostly a legacy naming - the bits work for both 64 and 32. */ |
| #define STS_LDT 0x2 /* 64-bit Local Descriptor Table */ |
| #define STS_T32A 0x9 /* Available 64-bit TSS */ |
| #define STS_T32B 0xB /* Busy 64-bit TSS */ |
| #define STS_CG32 0xC /* 64-bit Call Gate */ |
| #define STS_IG32 0xE /* 64-bit Interrupt Gate */ |
| #define STS_TG32 0xF /* 64-bit Trap Gate */ |
| |
| #define SEG_COUNT 7 /* Number of GDT segments */ |
| /* TODO: Probably won't use this */ |
| #define LDT_SIZE (8192 * sizeof(segdesc_t)) |
| |
| /* TLS 'syscall', coupled to trapentry64.S. Needed a non-canon 'addr' */ |
| #define FASTCALL_SETFSBASE 0xf0f0000000000001 |
