Files
mango/arch/x86_64/irq.c

640 lines
19 KiB
C
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2023-02-08 20:24:40 +00:00
#include <arch/irq.h>
#include <arch/msr.h>
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#include <arch/ports.h>
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#include <mango/cpu.h>
#include <mango/libc/string.h>
#include <mango/machine/cpu.h>
#include <mango/machine/irq.h>
#include <mango/panic.h>
#include <mango/sched.h>
#include <mango/syscall.h>
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#include <stddef.h>
#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
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extern void syscall_gate(void);
extern uintptr_t pf_faultptr(void);
static int_hook isr_handlers[NR_IDT_ENTRIES];
static struct queue irq_hooks[223];
static struct idt idt;
static int idt_initialised = 0;
static uintptr_t int_entry_points[NR_IDT_ENTRIES];
static void set_syscall_gate(uintptr_t rip)
{
uint64_t user_cs = 0x13;
uint64_t kernel_cs = 0x8;
uintptr_t star_reg = 0xC0000081;
uintptr_t lstar_reg = 0xC0000082;
uintptr_t sfmask_reg = 0xC0000084;
uint64_t selectors = 0;
selectors |= (user_cs) << 48;
selectors |= (kernel_cs) << 32;
/* disable interrupts */
uint64_t flag_mask = 0x200;
wrmsr(star_reg, selectors);
wrmsr(lstar_reg, rip);
wrmsr(sfmask_reg, flag_mask);
}
static void set_idt_gate(
struct idt *idt,
uint8_t index,
uintptr_t base,
uint16_t sel,
uint8_t flags)
{
idt->i_entries[index].base_low = base & 0xFFFF;
idt->i_entries[index].base_middle = (base >> 16) & 0xFFFF;
idt->i_entries[index].base_high = (base >> 32) & 0xFFFFFFFF;
idt->i_entries[index].selector = sel;
idt->i_entries[index].always0 = 0;
idt->i_entries[index].present = 1;
idt->i_entries[index].dpl = 3;
idt->i_entries[index].zero = 0;
idt->i_entries[index].type = 0xE;
idt->i_entries[index].reserved = 0;
}
static void gpf_handler(struct ml_cpu_context *regs)
{
int ext = regs->err_no & 1;
int table = (regs->err_no >> 1) & 0x03;
int index = (regs->err_no >> 3) & 0x1FFF;
panic_irq(
regs,
"general protection fault (%016llx %02x %02x %04x %016llx)",
regs->err_no,
ext,
table,
index,
regs->rip);
}
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)",
fault_ptr,
regs->rip,
regs->err_no);
}
static void init_pic(void)
{
// Remap the PIC
outportb(0x20, 0x11);
outportb(0xA0, 0x11);
outportb(0x21, 0x20);
outportb(0xA1, 0x28);
outportb(0x21, 0x04);
outportb(0xA1, 0x02);
outportb(0x21, 0x01);
outportb(0xA1, 0x01);
outportb(0x21, 0x0);
outportb(0xA1, 0x0);
isr_handlers[13] = gpf_handler;
isr_handlers[14] = pf_handler;
}
static void init_global_idt(void)
{
memset((void *)&idt.i_entries, 0, sizeof idt.i_entries);
for (int i = 0; i < NR_IDT_ENTRIES; i++) {
set_idt_gate(&idt, i, int_entry_points[i], 0x08, 0x8E);
}
init_pic();
idt_initialised = 1;
}
int idt_init(struct idt_ptr *ptr)
{
if (idt_initialised == 0) {
init_global_idt();
}
set_syscall_gate((uintptr_t)syscall_gate);
ptr->i_limit = sizeof(idt) - 1;
ptr->i_base = (uintptr_t)&idt;
return 0;
}
int idt_load(struct idt_ptr *ptr)
{
__asm__ __volatile__("lidt (%0)" ::"r"(ptr));
return 0;
}
void isr_dispatch(struct ml_cpu_context *regs)
{
int_hook h = isr_handlers[regs->int_no];
if (h) {
h(regs);
} else {
panic_irq(regs, "unhandled exception %u", regs->int_no);
}
}
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void irq_ack(unsigned int vec)
{
if (vec >= 40) {
outportb(0xA0, 0x20);
}
outportb(0x20, 0x20);
}
void irq_dispatch(struct ml_cpu_context *regs)
{
end_charge_period();
irq_ack(regs->int_no);
struct queue *hooks = &irq_hooks[regs->int_no - IRQ0];
queue_foreach(struct irq_hook, hook, hooks, irq_entry)
{
hook->irq_callback();
}
if (need_resched()) {
schedule(SCHED_IRQ);
}
start_charge_period();
}
void syscall_dispatch(struct ml_cpu_context *regs)
{
unsigned int sysid = regs->rax;
virt_addr_t syscall_impl = syscall_get_func(sysid);
if (syscall_impl == 0) {
regs->rax = KERN_UNSUPPORTED;
return;
}
#define SYSCALL_SIGNATURE(...) \
intptr_t (*__VA_ARGS__)( \
uintptr_t, \
uintptr_t, \
uintptr_t, \
uintptr_t, \
uintptr_t, \
uintptr_t, \
uintptr_t, \
uintptr_t)
SYSCALL_SIGNATURE(fn) = (SYSCALL_SIGNATURE())syscall_impl;
regs->rax
= fn(regs->rdi,
regs->rsi,
regs->rdx,
regs->r12,
regs->r8,
regs->r9,
regs->r13,
regs->r14);
}
void hook_irq(enum irq_vector vec, struct irq_hook *hook)
{
struct queue *hook_queue = &irq_hooks[vec - IRQ0];
queue_push_back(hook_queue, &hook->irq_entry);
}
void unhook_irq(enum irq_vector vec, struct irq_hook *hook)
{
struct queue *hook_queue = &irq_hooks[vec - IRQ0];
queue_delete(hook_queue, &hook->irq_entry);
}
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extern void _isr0(void);
extern void _isr1(void);
extern void _isr2(void);
extern void _isr3(void);
extern void _isr4(void);
extern void _isr5(void);
extern void _isr6(void);
extern void _isr7(void);
extern void _isr8(void);
extern void _isr9(void);
extern void _isr10(void);
extern void _isr11(void);
extern void _isr12(void);
extern void _isr13(void);
extern void _isr14(void);
extern void _isr15(void);
extern void _isr16(void);
extern void _isr17(void);
extern void _isr18(void);
extern void _isr19(void);
extern void _isr20(void);
extern void _isr21(void);
extern void _isr22(void);
extern void _isr23(void);
extern void _isr24(void);
extern void _isr25(void);
extern void _isr26(void);
extern void _isr27(void);
extern void _isr28(void);
extern void _isr29(void);
extern void _isr30(void);
extern void _isr31(void);
extern void _irq0(void);
extern void _irq1(void);
extern void _irq2(void);
extern void _irq3(void);
extern void _irq4(void);
extern void _irq5(void);
extern void _irq6(void);
extern void _irq7(void);
extern void _irq8(void);
extern void _irq9(void);
extern void _irq10(void);
extern void _irq11(void);
extern void _irq12(void);
extern void _irq13(void);
extern void _irq14(void);
extern void _irq15(void);
extern void _irq16(void);
extern void _irq17(void);
extern void _irq18(void);
extern void _irq19(void);
extern void _irq20(void);
extern void _irq21(void);
extern void _irq22(void);
extern void _irq23(void);
extern void _irq24(void);
extern void _irq25(void);
extern void _irq26(void);
extern void _irq27(void);
extern void _irq28(void);
extern void _irq29(void);
extern void _irq30(void);
extern void _irq31(void);
extern void _irq32(void);
extern void _irq33(void);
extern void _irq34(void);
extern void _irq35(void);
extern void _irq36(void);
extern void _irq37(void);
extern void _irq38(void);
extern void _irq39(void);
extern void _irq40(void);
extern void _irq41(void);
extern void _irq42(void);
extern void _irq43(void);
extern void _irq44(void);
extern void _irq45(void);
extern void _irq46(void);
extern void _irq47(void);
extern void _irq48(void);
extern void _irq49(void);
extern void _irq50(void);
extern void _irq51(void);
extern void _irq52(void);
extern void _irq53(void);
extern void _irq54(void);
extern void _irq55(void);
extern void _irq56(void);
extern void _irq57(void);
extern void _irq58(void);
extern void _irq59(void);
extern void _irq60(void);
extern void _irq61(void);
extern void _irq62(void);
extern void _irq63(void);
extern void _irq64(void);
extern void _irq65(void);
extern void _irq66(void);
extern void _irq67(void);
extern void _irq68(void);
extern void _irq69(void);
extern void _irq70(void);
extern void _irq71(void);
extern void _irq72(void);
extern void _irq73(void);
extern void _irq74(void);
extern void _irq75(void);
extern void _irq76(void);
extern void _irq77(void);
extern void _irq78(void);
extern void _irq79(void);
extern void _irq80(void);
extern void _irq81(void);
extern void _irq82(void);
extern void _irq83(void);
extern void _irq84(void);
extern void _irq85(void);
extern void _irq86(void);
extern void _irq87(void);
extern void _irq88(void);
extern void _irq89(void);
extern void _irq90(void);
extern void _irq91(void);
extern void _irq92(void);
extern void _irq93(void);
extern void _irq94(void);
extern void _irq95(void);
extern void _irq96(void);
extern void _irq97(void);
extern void _irq98(void);
extern void _irq99(void);
extern void _irq100(void);
extern void _irq101(void);
extern void _irq102(void);
extern void _irq103(void);
extern void _irq104(void);
extern void _irq105(void);
extern void _irq106(void);
extern void _irq107(void);
extern void _irq108(void);
extern void _irq109(void);
extern void _irq110(void);
extern void _irq111(void);
extern void _irq112(void);
extern void _irq113(void);
extern void _irq114(void);
extern void _irq115(void);
extern void _irq116(void);
extern void _irq117(void);
extern void _irq118(void);
extern void _irq119(void);
extern void _irq120(void);
extern void _irq121(void);
extern void _irq122(void);
extern void _irq123(void);
extern void _irq124(void);
extern void _irq125(void);
extern void _irq126(void);
extern void _irq127(void);
extern void _irq128(void);
extern void _irq129(void);
extern void _irq130(void);
extern void _irq131(void);
extern void _irq132(void);
extern void _irq133(void);
extern void _irq134(void);
extern void _irq135(void);
extern void _irq136(void);
extern void _irq137(void);
extern void _irq138(void);
extern void _irq139(void);
extern void _irq140(void);
extern void _irq141(void);
extern void _irq142(void);
extern void _irq143(void);
extern void _irq144(void);
extern void _irq145(void);
extern void _irq146(void);
extern void _irq147(void);
extern void _irq148(void);
extern void _irq149(void);
extern void _irq150(void);
extern void _irq151(void);
extern void _irq152(void);
extern void _irq153(void);
extern void _irq154(void);
extern void _irq155(void);
extern void _irq156(void);
extern void _irq157(void);
extern void _irq158(void);
extern void _irq159(void);
extern void _irq160(void);
extern void _irq161(void);
extern void _irq162(void);
extern void _irq163(void);
extern void _irq164(void);
extern void _irq165(void);
extern void _irq166(void);
extern void _irq167(void);
extern void _irq168(void);
extern void _irq169(void);
extern void _irq170(void);
extern void _irq171(void);
extern void _irq172(void);
extern void _irq173(void);
extern void _irq174(void);
extern void _irq175(void);
extern void _irq176(void);
extern void _irq177(void);
extern void _irq178(void);
extern void _irq179(void);
extern void _irq180(void);
extern void _irq181(void);
extern void _irq182(void);
extern void _irq183(void);
extern void _irq184(void);
extern void _irq185(void);
extern void _irq186(void);
extern void _irq187(void);
extern void _irq188(void);
extern void _irq189(void);
extern void _irq190(void);
extern void _irq191(void);
extern void _irq192(void);
extern void _irq193(void);
extern void _irq194(void);
extern void _irq195(void);
extern void _irq196(void);
extern void _irq197(void);
extern void _irq198(void);
extern void _irq199(void);
extern void _irq200(void);
extern void _irq201(void);
extern void _irq202(void);
extern void _irq203(void);
extern void _irq204(void);
extern void _irq205(void);
extern void _irq206(void);
extern void _irq207(void);
extern void _irq208(void);
extern void _irq209(void);
extern void _irq210(void);
extern void _irq211(void);
extern void _irq212(void);
extern void _irq213(void);
extern void _irq214(void);
extern void _irq215(void);
extern void _irq216(void);
extern void _irq217(void);
extern void _irq218(void);
extern void _irq219(void);
extern void _irq220(void);
extern void _irq221(void);
extern void _irq222(void);
extern void _irq223(void);
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static uintptr_t int_entry_points[NR_IDT_ENTRIES] = {
[0] = (uintptr_t)_isr0, [1] = (uintptr_t)_isr1,
[2] = (uintptr_t)_isr2, [3] = (uintptr_t)_isr3,
[4] = (uintptr_t)_isr4, [5] = (uintptr_t)_isr5,
[6] = (uintptr_t)_isr6, [7] = (uintptr_t)_isr7,
[8] = (uintptr_t)_isr8, [9] = (uintptr_t)_isr9,
[10] = (uintptr_t)_isr10, [11] = (uintptr_t)_isr11,
[12] = (uintptr_t)_isr12, [13] = (uintptr_t)_isr13,
[14] = (uintptr_t)_isr14, [15] = (uintptr_t)_isr15,
[16] = (uintptr_t)_isr16, [17] = (uintptr_t)_isr17,
[18] = (uintptr_t)_isr18, [19] = (uintptr_t)_isr19,
[20] = (uintptr_t)_isr20, [21] = (uintptr_t)_isr21,
[22] = (uintptr_t)_isr22, [23] = (uintptr_t)_isr23,
[24] = (uintptr_t)_isr24, [25] = (uintptr_t)_isr25,
[26] = (uintptr_t)_isr26, [27] = (uintptr_t)_isr27,
[28] = (uintptr_t)_isr28, [29] = (uintptr_t)_isr29,
[30] = (uintptr_t)_isr30, [31] = (uintptr_t)_isr31,
[32] = (uintptr_t)_irq0, [33] = (uintptr_t)_irq1,
[34] = (uintptr_t)_irq2, [35] = (uintptr_t)_irq3,
[36] = (uintptr_t)_irq4, [37] = (uintptr_t)_irq5,
[38] = (uintptr_t)_irq6, [39] = (uintptr_t)_irq7,
[40] = (uintptr_t)_irq8, [41] = (uintptr_t)_irq9,
[42] = (uintptr_t)_irq10, [43] = (uintptr_t)_irq11,
[44] = (uintptr_t)_irq12, [45] = (uintptr_t)_irq13,
[46] = (uintptr_t)_irq14, [47] = (uintptr_t)_irq15,
[48] = (uintptr_t)_irq16, [49] = (uintptr_t)_irq17,
[50] = (uintptr_t)_irq18, [51] = (uintptr_t)_irq19,
[52] = (uintptr_t)_irq20, [53] = (uintptr_t)_irq21,
[54] = (uintptr_t)_irq22, [55] = (uintptr_t)_irq23,
[56] = (uintptr_t)_irq24, [57] = (uintptr_t)_irq25,
[58] = (uintptr_t)_irq26, [59] = (uintptr_t)_irq27,
[60] = (uintptr_t)_irq28, [61] = (uintptr_t)_irq29,
[62] = (uintptr_t)_irq30, [63] = (uintptr_t)_irq31,
[64] = (uintptr_t)_irq32, [65] = (uintptr_t)_irq33,
[66] = (uintptr_t)_irq34, [67] = (uintptr_t)_irq35,
[68] = (uintptr_t)_irq36, [69] = (uintptr_t)_irq37,
[70] = (uintptr_t)_irq38, [71] = (uintptr_t)_irq39,
[72] = (uintptr_t)_irq40, [73] = (uintptr_t)_irq41,
[74] = (uintptr_t)_irq42, [75] = (uintptr_t)_irq43,
[76] = (uintptr_t)_irq44, [77] = (uintptr_t)_irq45,
[78] = (uintptr_t)_irq46, [79] = (uintptr_t)_irq47,
[80] = (uintptr_t)_irq48, [81] = (uintptr_t)_irq49,
[82] = (uintptr_t)_irq50, [83] = (uintptr_t)_irq51,
[84] = (uintptr_t)_irq52, [85] = (uintptr_t)_irq53,
[86] = (uintptr_t)_irq54, [87] = (uintptr_t)_irq55,
[88] = (uintptr_t)_irq56, [89] = (uintptr_t)_irq57,
[90] = (uintptr_t)_irq58, [91] = (uintptr_t)_irq59,
[92] = (uintptr_t)_irq60, [93] = (uintptr_t)_irq61,
[94] = (uintptr_t)_irq62, [95] = (uintptr_t)_irq63,
[96] = (uintptr_t)_irq64, [97] = (uintptr_t)_irq65,
[98] = (uintptr_t)_irq66, [99] = (uintptr_t)_irq67,
[100] = (uintptr_t)_irq68, [101] = (uintptr_t)_irq69,
[102] = (uintptr_t)_irq70, [103] = (uintptr_t)_irq71,
[104] = (uintptr_t)_irq72, [105] = (uintptr_t)_irq73,
[106] = (uintptr_t)_irq74, [107] = (uintptr_t)_irq75,
[108] = (uintptr_t)_irq76, [109] = (uintptr_t)_irq77,
[110] = (uintptr_t)_irq78, [111] = (uintptr_t)_irq79,
[112] = (uintptr_t)_irq80, [113] = (uintptr_t)_irq81,
[114] = (uintptr_t)_irq82, [115] = (uintptr_t)_irq83,
[116] = (uintptr_t)_irq84, [117] = (uintptr_t)_irq85,
[118] = (uintptr_t)_irq86, [119] = (uintptr_t)_irq87,
[120] = (uintptr_t)_irq88, [121] = (uintptr_t)_irq89,
[122] = (uintptr_t)_irq90, [123] = (uintptr_t)_irq91,
[124] = (uintptr_t)_irq92, [125] = (uintptr_t)_irq93,
[126] = (uintptr_t)_irq94, [127] = (uintptr_t)_irq95,
[128] = (uintptr_t)_irq96, [129] = (uintptr_t)_irq97,
[130] = (uintptr_t)_irq98, [131] = (uintptr_t)_irq99,
[132] = (uintptr_t)_irq100, [133] = (uintptr_t)_irq101,
[134] = (uintptr_t)_irq102, [135] = (uintptr_t)_irq103,
[136] = (uintptr_t)_irq104, [137] = (uintptr_t)_irq105,
[138] = (uintptr_t)_irq106, [139] = (uintptr_t)_irq107,
[140] = (uintptr_t)_irq108, [141] = (uintptr_t)_irq109,
[142] = (uintptr_t)_irq110, [143] = (uintptr_t)_irq111,
[144] = (uintptr_t)_irq112, [145] = (uintptr_t)_irq113,
[146] = (uintptr_t)_irq114, [147] = (uintptr_t)_irq115,
[148] = (uintptr_t)_irq116, [149] = (uintptr_t)_irq117,
[150] = (uintptr_t)_irq118, [151] = (uintptr_t)_irq119,
[152] = (uintptr_t)_irq120, [153] = (uintptr_t)_irq121,
[154] = (uintptr_t)_irq122, [155] = (uintptr_t)_irq123,
[156] = (uintptr_t)_irq124, [157] = (uintptr_t)_irq125,
[158] = (uintptr_t)_irq126, [159] = (uintptr_t)_irq127,
[160] = (uintptr_t)_irq128, [161] = (uintptr_t)_irq129,
[162] = (uintptr_t)_irq130, [163] = (uintptr_t)_irq131,
[164] = (uintptr_t)_irq132, [165] = (uintptr_t)_irq133,
[166] = (uintptr_t)_irq134, [167] = (uintptr_t)_irq135,
[168] = (uintptr_t)_irq136, [169] = (uintptr_t)_irq137,
[170] = (uintptr_t)_irq138, [171] = (uintptr_t)_irq139,
[172] = (uintptr_t)_irq140, [173] = (uintptr_t)_irq141,
[174] = (uintptr_t)_irq142, [175] = (uintptr_t)_irq143,
[176] = (uintptr_t)_irq144, [177] = (uintptr_t)_irq145,
[178] = (uintptr_t)_irq146, [179] = (uintptr_t)_irq147,
[180] = (uintptr_t)_irq148, [181] = (uintptr_t)_irq149,
[182] = (uintptr_t)_irq150, [183] = (uintptr_t)_irq151,
[184] = (uintptr_t)_irq152, [185] = (uintptr_t)_irq153,
[186] = (uintptr_t)_irq154, [187] = (uintptr_t)_irq155,
[188] = (uintptr_t)_irq156, [189] = (uintptr_t)_irq157,
[190] = (uintptr_t)_irq158, [191] = (uintptr_t)_irq159,
[192] = (uintptr_t)_irq160, [193] = (uintptr_t)_irq161,
[194] = (uintptr_t)_irq162, [195] = (uintptr_t)_irq163,
[196] = (uintptr_t)_irq164, [197] = (uintptr_t)_irq165,
[198] = (uintptr_t)_irq166, [199] = (uintptr_t)_irq167,
[200] = (uintptr_t)_irq168, [201] = (uintptr_t)_irq169,
[202] = (uintptr_t)_irq170, [203] = (uintptr_t)_irq171,
[204] = (uintptr_t)_irq172, [205] = (uintptr_t)_irq173,
[206] = (uintptr_t)_irq174, [207] = (uintptr_t)_irq175,
[208] = (uintptr_t)_irq176, [209] = (uintptr_t)_irq177,
[210] = (uintptr_t)_irq178, [211] = (uintptr_t)_irq179,
[212] = (uintptr_t)_irq180, [213] = (uintptr_t)_irq181,
[214] = (uintptr_t)_irq182, [215] = (uintptr_t)_irq183,
[216] = (uintptr_t)_irq184, [217] = (uintptr_t)_irq185,
[218] = (uintptr_t)_irq186, [219] = (uintptr_t)_irq187,
[220] = (uintptr_t)_irq188, [221] = (uintptr_t)_irq189,
[222] = (uintptr_t)_irq190, [223] = (uintptr_t)_irq191,
[224] = (uintptr_t)_irq192, [225] = (uintptr_t)_irq193,
[226] = (uintptr_t)_irq194, [227] = (uintptr_t)_irq195,
[228] = (uintptr_t)_irq196, [229] = (uintptr_t)_irq197,
[230] = (uintptr_t)_irq198, [231] = (uintptr_t)_irq199,
[232] = (uintptr_t)_irq200, [233] = (uintptr_t)_irq201,
[234] = (uintptr_t)_irq202, [235] = (uintptr_t)_irq203,
[236] = (uintptr_t)_irq204, [237] = (uintptr_t)_irq205,
[238] = (uintptr_t)_irq206, [239] = (uintptr_t)_irq207,
[240] = (uintptr_t)_irq208, [241] = (uintptr_t)_irq209,
[242] = (uintptr_t)_irq210, [243] = (uintptr_t)_irq211,
[244] = (uintptr_t)_irq212, [245] = (uintptr_t)_irq213,
[246] = (uintptr_t)_irq214, [247] = (uintptr_t)_irq215,
[248] = (uintptr_t)_irq216, [249] = (uintptr_t)_irq217,
[250] = (uintptr_t)_irq218, [251] = (uintptr_t)_irq219,
[252] = (uintptr_t)_irq220, [253] = (uintptr_t)_irq221,
[254] = (uintptr_t)_irq222, [255] = (uintptr_t)_irq223,
};