From d1ff7bcc91886626dc9060ec5fb67ee102ab7c1d Mon Sep 17 00:00:00 2001 From: Jon Santmyer Date: Mon, 11 Mar 2024 21:30:31 -0400 Subject: usermode capable kernel with logging syscall --- arch/x86_64/tables.h | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 arch/x86_64/tables.h (limited to 'arch/x86_64/tables.h') diff --git a/arch/x86_64/tables.h b/arch/x86_64/tables.h new file mode 100644 index 0000000..8e43bec --- /dev/null +++ b/arch/x86_64/tables.h @@ -0,0 +1,60 @@ +#ifndef JOVE_ARCH_X86_64_TABLES_H +#define JOVE_ARCH_X86_64_TABLES_H 1 + +#include + +#define CD_SEGMENT_TYPE_ACCESSED 1 +#define CD_SEGMENT_TYPE_WRITEABLE 2 +#define CD_SEGMENT_TYPE_DATA_EXPAND_DOWN 4 +#define CD_SEGMENT_TYPE_CODE_CONFORMING 4 +#define CD_SEGMENT_TYPE_CODE 8 + +#define S_SEGMENT_TYPE_LDT 2 +#define S_SEGMENT_TYPE_TSS_AVAIL 9 +#define S_SEGMENT_TYPE_TSS_BUSY 11 +#define S_SEGMENT_TYPE_CALLGATE 12 +#define S_SEGMENT_TYPE_INT_GATE 14 +#define S_SEGMENT_TYPE_TRAP_GATE 15 + +struct SegmentDescriptor +{ + uint16_t limit_0_15; /* Segment limit. */ + uint16_t base_0_15; /* Segment base. */ + uint8_t base_16_23; + uint8_t type : 4; /* Segment type. */ + uint8_t s : 1; /* Descriptor type (0 = system, 1 = code/data)*/ + uint8_t dpl : 2; /* Descriptor privilege level. */ + uint8_t p : 1; ; /* Present. */ + uint8_t limit_16_19 : 4; + uint8_t avl : 1; /* Available for use by system software. */ + uint8_t l : 1; /* 64-bit segment (Ext). */ + uint8_t d_b : 1; /* Default operation size (0 = 16-bit, 1 = 32-bit)*/ + uint8_t g : 1; /* Granularity. */ + uint8_t base_24_31; +}__attribute__((packed)); + +struct InterruptTrapGate +{ + uint16_t base_0_15; + uint16_t segment_selector; + uint8_t ist : 3; + uint8_t zero_0 : 5; + uint8_t type : 4; + uint8_t zero_1 : 1; + uint8_t dpl : 2; + uint8_t p : 1; + uint16_t base_16_31; + uint32_t base_32_63; + +}__attribute__((packed)); + +struct XDTR /* Generic table descriptor struct */ +{ + uint16_t length; + uint64_t address; +}__attribute__((packed)); + +void x86_64_load_gdt(void); +void x86_64_load_idt(void); + +#endif -- cgit v1.2.1