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63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
#include <amd64/gdt.h>
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#include <amd64/intr.h>
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#include <amd64/mm.h>
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#include <amd64/msr-index.h>
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#include <amd64/msr.h>
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#include <libk/string.h>
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#include <m/status.h>
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#include <m/syscall_defs.h>
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#include <proc/proc.h>
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#include <sys/debug.h>
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#include <sys/smp.h>
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#include <syscall/syscall.h>
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extern void amd64_syscall_entry (void);
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uintptr_t amd64_syscall_dispatch (void* stack_ptr) {
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amd64_load_kernel_cr3 ();
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struct saved_regs* regs = stack_ptr;
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spin_lock (&thiscpu->lock);
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struct proc* caller = thiscpu->proc_current;
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int caller_pid = caller->pid;
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spin_lock (&caller->lock);
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memcpy (&caller->pdata.regs, regs, sizeof (struct saved_regs));
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spin_unlock (&caller->lock);
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spin_unlock (&thiscpu->lock);
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int syscall_num = regs->rax;
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syscall_handler_func_t func = syscall_find_handler (syscall_num);
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if (func == NULL) {
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return -ST_SYSCALL_NOT_FOUND;
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}
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bool reschedule = false;
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struct cpu* reschedule_cpu = NULL;
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uintptr_t r = func (caller, regs, &reschedule, &reschedule_cpu, regs->rdi, regs->rsi, regs->rdx,
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regs->r10, regs->r8, regs->r9);
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caller = proc_find_pid (caller_pid);
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if (caller != NULL) {
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spin_lock (&caller->lock);
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caller->pdata.regs.rax = r;
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spin_unlock (&caller->lock);
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}
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if (reschedule)
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cpu_request_sched (reschedule_cpu);
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return r;
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}
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void syscall_init (void) {
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amd64_wrmsr (MSR_STAR, ((uint64_t)GDT_KCODE << 32) | ((uint64_t)(GDT_KDATA | 0x03) << 48));
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amd64_wrmsr (MSR_LSTAR, (uint64_t)&amd64_syscall_entry);
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amd64_wrmsr (MSR_SYSCALL_MASK, (1ULL << 9));
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amd64_wrmsr (MSR_EFER, amd64_rdmsr (MSR_EFER) | EFER_SCE);
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}
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