43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
#include <kernel/machine/cpu.h>
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#include <kernel/machine/thread.h>
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/* this is the context information restored by ml_thread_switch.
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* since ml_thread_switch only jumps to kernel-mode, IRETQ isn't used,
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* and the extra register values needed by IRETQ aren't present. */
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struct thread_ctx {
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uint64_t r15, r14, r13, r12, r11, r10, r9, r8;
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uint64_t rdi, rsi, rbp, unused_rsp, rbx, rdx, rcx, rax;
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uint64_t rfl;
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} __packed;
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void ml_thread_prepare_kernel_context(uintptr_t ip, uintptr_t *sp)
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{
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(*sp) -= sizeof(uintptr_t);
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uintptr_t *dest_ip = (uintptr_t *)(*sp);
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*dest_ip = ip;
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(*sp) -= sizeof(struct thread_ctx);
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struct thread_ctx *ctx = (struct thread_ctx *)(*sp);
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memset(ctx, 0x0, sizeof *ctx);
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ctx->rfl = 0x202;
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}
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extern void ml_thread_prepare_user_context(
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virt_addr_t ip,
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virt_addr_t user_sp,
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virt_addr_t *kernel_sp)
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{
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(*kernel_sp) -= sizeof(struct ml_cpu_context);
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struct ml_cpu_context *ctx = (struct ml_cpu_context *)(*kernel_sp);
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memset(ctx, 0x0, sizeof *ctx);
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ctx->rip = ip;
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ctx->rsp = user_sp;
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ctx->ss = 0x1b;
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ctx->cs = 0x23;
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ctx->rflags = 0x202;
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ctx->rdi = 0; // arg 0
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ctx->rsi = 0; // arg 1
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}
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