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x86_64: irq: route user-mode page faults to pmap_handle_fault

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This commit is contained in:
max 🍓
2026-02-08 13:05:29 +00:00
parent 5f2ad06fb0
commit 343689764f
1 changed files with 29 additions and 2 deletions
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29
arch/x86_64/irq.c
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@@ -11,6 +11,12 @@
#define MAX_ISR_HANDLERS 16
#define PF_PRESENT 0x01u
#define PF_WRITE 0x02u
#define PF_USER 0x04u
#define PF_RESERVED_WRITE 0x08u
#define PF_IFETCH 0x10u
extern void syscall_gate(void);
extern uintptr_t pf_faultptr(void);
@@ -79,10 +85,31 @@ static void gpf_handler(struct ml_cpu_context *regs)
static void pf_handler(struct ml_cpu_context *regs)
{
enum pmap_fault_flags fault_flags = 0;
(regs->err_no & PF_PRESENT) && (fault_flags |= PMAP_FAULT_PRESENT);
(regs->err_no & PF_USER) && (fault_flags |= PMAP_FAULT_USER);
(regs->err_no & PF_WRITE) && (fault_flags |= PMAP_FAULT_WRITE);
(regs->err_no & PF_IFETCH) && (fault_flags |= PMAP_FAULT_IFETCH);
(regs->err_no & PF_RESERVED_WRITE)
&& (fault_flags |= PMAP_FAULT_BADCFG);
virt_addr_t fault_ptr = pf_faultptr();
kern_status_t status = KERN_FATAL_ERROR;
if (regs->err_no & PF_USER) {
status = pmap_handle_fault(fault_ptr, fault_flags);
}
if (status == KERN_OK) {
return;
}
panic_irq(
regs,
"page fault (%016llx %016llx %016llx)",
pf_faultptr(),
fault_ptr,
regs->rip,
regs->err_no);
}