1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <asm/trap_pf.h> 3 #include <asm/segment.h> 4 #include <asm/trapnr.h> 5 #include "misc.h" 6 7 static void set_idt_entry(int vector, void (*handler)(void)) 8 { 9 unsigned long address = (unsigned long)handler; 10 gate_desc entry; 11 12 memset(&entry, 0, sizeof(entry)); 13 14 entry.offset_low = (u16)(address & 0xffff); 15 entry.segment = __KERNEL_CS; 16 entry.bits.type = GATE_TRAP; 17 entry.bits.p = 1; 18 entry.offset_middle = (u16)((address >> 16) & 0xffff); 19 entry.offset_high = (u32)(address >> 32); 20 21 memcpy(&boot_idt[vector], &entry, sizeof(entry)); 22 } 23 24 /* Have this here so we don't need to include <asm/desc.h> */ 25 static void load_boot_idt(const struct desc_ptr *dtr) 26 { 27 asm volatile("lidt %0"::"m" (*dtr)); 28 } 29 30 /* Setup IDT before kernel jumping to .Lrelocated */ 31 void load_stage1_idt(void) 32 { 33 boot_idt_desc.address = (unsigned long)boot_idt; 34 35 load_boot_idt(&boot_idt_desc); 36 } 37 38 /* Setup IDT after kernel jumping to .Lrelocated */ 39 void load_stage2_idt(void) 40 { 41 boot_idt_desc.address = (unsigned long)boot_idt; 42 43 load_boot_idt(&boot_idt_desc); 44 } 45