Initial commit: Schunix as it stands before the SchOS rename
An x86-64 operating system built from xv6, now largely rewritten: SMP, a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF rasteriser, and a Linux-numbered syscall ABI. No history before this point -- the tree was never under version control. This commit exists so the rename that follows has something to undo to.
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Nexoniarz
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130
include/mmu.h
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130
include/mmu.h
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#pragma once
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// Eflags register
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#define FL_CF 0x00000001 // Carry Flag
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#define FL_PF 0x00000004 // Parity Flag
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#define FL_AF 0x00000010 // Auxiliary carry Flag
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#define FL_ZF 0x00000040 // Zero Flag
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#define FL_SF 0x00000080 // Sign Flag
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#define FL_TF 0x00000100 // Trap Flag
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#define FL_IF 0x00000200 // Interrupt Enable
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#define FL_DF 0x00000400 // Direction Flag
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#define FL_OF 0x00000800 // Overflow Flag
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#define FL_IOPL_MASK 0x00003000 // I/O Privilege Level bitmask
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#define FL_NT 0x00004000 // Nested Task
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#define FL_RF 0x00010000 // Resume Flag
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#define FL_VM 0x00020000 // Virtual 8086 mode
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#define FL_AC 0x00040000 // Alignment Check
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#define FL_VIF 0x00080000 // Virtual Interrupt Flag
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#define FL_VIP 0x00100000 // Virtual Interrupt Pending
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#define FL_ID 0x00200000 // ID flag
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// Control Register flags
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#define CR0_PE 0x00000001 // Protection Enable
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#define CR0_MP 0x00000002 // Monitor coProcessor
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#define CR0_EM 0x00000004 // Emulation
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#define CR0_TS 0x00000008 // Task Switched
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#define CR0_ET 0x00000010 // Extension Type
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#define CR0_NE 0x00000020 // Numeric Errror
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#define CR0_WP 0x00010000 // Write Protect
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#define CR0_AM 0x00040000 // Alignment Mask
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#define CR0_NW 0x20000000 // Not Writethrough
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#define CR0_CD 0x40000000 // Cache Disable
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#define CR0_PG 0x80000000 // Paging
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#define CR4_PSE 0x00000010 // Page size extension
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#define CR4_PAE 0x00000020 // Physical address extensions
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#define CR4_OSXFSR 0x00000200 // OS supports FXSAVE and FXRSTOR
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#define CR4_OSXMMEXCPT 0x00000400 // OS supports SSE exceptions
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// Model specific registers
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#define MSR_EFER 0xC0000080 // Extended Feature Enable Register
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#define MSR_STAR 0xC0000081 // Legacy Mode SYSCALL Target
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#define MSR_LSTAR 0xC0000082 // Long Mode SYSCALL Target
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#define MSR_CSTAR 0xC0000083 // Compatibility Mode SYSCALL Target
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#define MSR_SFMASK 0xC0000084 // SYSCALL Flag Mask
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// Segment selectors
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#define SEG_KCODE 1
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#define SEG_KDATA 2
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#define SEG_UCODE32 3
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#define SEG_UDATA 4
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#define SEG_UCODE 5
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#define SEG_KCPU 6
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#define SEG_TSS 7 // TSS takes 2 slots in 64-bit GDT
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#define NSEGS 9
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#define DPL_USER 0x3
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#define USER_CS ((SEG_UCODE<<3)|DPL_USER)
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#define USER_DS ((SEG_UDATA<<3)|DPL_USER)
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#define KERNEL_CS (SEG_KCODE<<3)
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#ifndef __ASSEMBLER__
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// Segment Descriptor
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struct segdesc {
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uint32 lim_15_0 : 16; // Low bits of segment limit
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uint32 base_15_0 : 16; // Low bits of segment base address
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uint32 base_23_16 : 8; // Middle bits of segment base address
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uint32 type : 4; // Segment type
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uint32 s : 1; // 0 = system, 1 = application
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uint32 dpl : 2; // Descriptor Privilege Level
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uint32 p : 1; // Present
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uint32 lim_19_16 : 4; // High bits of segment limit
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uint32 avl : 1; // Available for software use
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uint32 l : 1; // 1 = 64-bit segment (Long mode)
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uint32 db : 1; // 0 = 16-bit, 1 = 32-bit
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uint32 g : 1; // Granularity
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uint32 base_31_24 : 8; // High bits of segment base address
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};
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// 64-bit System Segment Descriptor (e.g., TSS)
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struct desclong {
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struct segdesc sd;
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uint32 base_63_32; // High bits of 64-bit base address
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uint32 res; // Reserved
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};
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#define SEG(type, base, lim, dpl) (struct segdesc) \
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{ ((lim) >> 12) & 0xffff, (uint32)(base) & 0xffff, \
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((uint32)(base) >> 16) & 0xff, type, 1, dpl, 1, \
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(uint32)(lim) >> 28, 0, 1, 0, 1, (uint32)(base) >> 24 }
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#endif
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// Application segment type bits
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#define STA_X 0x8 // Executable segment
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#define STA_W 0x2 // Writeable (non-executable)
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#define STA_R 0x2 // Readable (executable)
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// System segment type bits
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#define STS_T64A 0x9 // Available 64-bit TSS
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#define STS_T64B 0xB // Busy 64-bit TSS
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#define STS_IG64 0xE // 64-bit Interrupt Gate
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#define STS_TG64 0xF // 64-bit Trap Gate
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// Page table structure: 4 levels
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#define PMX(va) (((addr_t)(va) >> 39) & 0x1FF)
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#define PDPX(va) (((addr_t)(va) >> 30) & 0x1FF)
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#define PDX(va) (((addr_t)(va) >> 21) & 0x1FF)
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#define PTX(va) (((addr_t)(va) >> 12) & 0x1FF)
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#define PGSIZE 4096
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#define PXMASK 0x1FF
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#define PGROUNDUP(sz) (((sz)+((addr_t)PGSIZE-1)) & ~((addr_t)(PGSIZE-1)))
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#define PGROUNDDOWN(a) (((a)) & ~((addr_t)(PGSIZE-1)))
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// Page table/directory entry flags
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#define PTE_P 0x001 // Present
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#define PTE_W 0x002 // Writeable
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#define PTE_U 0x004 // User
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#define PTE_PWT 0x008 // Write-Through
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#define PTE_PCD 0x010 // Cache-Disable
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#define PTE_A 0x020 // Accessed
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#define PTE_D 0x040 // Dirty
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#define PTE_PS 0x080 // Page Size (Huge Page)
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#define PTE_ADDR(pte) ((addr_t)(pte) & 0x000FFFFFFFFFF000ull)
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#define PTE_FLAGS(pte) ((addr_t)(pte) & 0xFFF)
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