| |
| #include "apic-defs.h" |
| |
| .globl boot_idt |
| boot_idt = 0 |
| |
| ipi_vector = 0x20 |
| |
| max_cpus = 64 |
| |
| .bss |
| |
| . = . + 4096 * max_cpus |
| .align 16 |
| stacktop: |
| |
| . = . + 4096 |
| .align 16 |
| ring0stacktop: |
| |
| .data |
| |
| .align 4096 |
| pt: |
| i = 0 |
| .rept 1024 |
| .long 0x1e7 | (i << 22) |
| i = i + 1 |
| .endr |
| |
| .globl gdt32 |
| gdt32: |
| .quad 0 |
| .quad 0x00cf9b000000ffff // flat 32-bit code segment |
| .quad 0x00cf93000000ffff // flat 32-bit data segment |
| .quad 0x00cf1b000000ffff // flat 32-bit code segment, not present |
| .quad 0x00cffb000000ffff // 64-bit code segment (user) |
| .quad 0x00cff3000000ffff // 64-bit data segment (user) |
| |
| .quad 0 // 10 spare selectors |
| .quad 0 |
| .quad 0 |
| .quad 0 |
| .quad 0 |
| .quad 0 |
| .quad 0 |
| .quad 0 |
| .quad 0 |
| .quad 0 |
| |
| tss_descr: |
| .rept max_cpus |
| .quad 0x000089000000ffff // 32-bit avail tss |
| .endr |
| gdt32_end: |
| |
| i = 0 |
| .globl tss |
| tss: |
| .rept max_cpus |
| .long 0 |
| .long ring0stacktop - i * 4096 |
| .long 16 |
| .quad 0, 0 |
| .quad 0, 0, 0, 0, 0, 0, 0, 0 |
| .long 0, 0, 0 |
| i = i + 1 |
| .endr |
| tss_end: |
| |
| idt_descr: |
| .word 16 * 256 - 1 |
| .long boot_idt |
| |
| .section .init |
| |
| .code32 |
| |
| mb_magic = 0x1BADB002 |
| mb_flags = 0x0 |
| |
| # multiboot header |
| .long mb_magic, mb_flags, 0 - (mb_magic + mb_flags) |
| mb_cmdline = 16 |
| |
| MSR_GS_BASE = 0xc0000101 |
| |
| .macro setup_percpu_area |
| lea -4096(%esp), %eax |
| mov $0, %edx |
| mov $MSR_GS_BASE, %ecx |
| wrmsr |
| .endm |
| |
| .globl start |
| start: |
| push %ebx |
| call setup_get_initrd |
| call setup_environ |
| mov mb_cmdline(%ebx), %eax |
| mov %eax, __args |
| call __setup_args |
| mov $stacktop, %esp |
| setup_percpu_area |
| call prepare_32 |
| jmpl $8, $start32 |
| |
| prepare_32: |
| lgdtl gdt32_descr |
| |
| mov %cr4, %eax |
| bts $4, %eax // pse |
| mov %eax, %cr4 |
| |
| mov $pt, %eax |
| mov %eax, %cr3 |
| |
| mov %cr0, %eax |
| bts $0, %eax |
| bts $31, %eax |
| mov %eax, %cr0 |
| ret |
| |
| smp_stacktop: .long 0xa0000 |
| |
| ap_start32: |
| mov $0x10, %ax |
| mov %ax, %ds |
| mov %ax, %es |
| mov %ax, %fs |
| mov %ax, %gs |
| mov %ax, %ss |
| mov $-4096, %esp |
| lock/xaddl %esp, smp_stacktop |
| setup_percpu_area |
| call prepare_32 |
| call load_tss |
| call enable_apic |
| call enable_x2apic |
| sti |
| nop |
| lock incw cpu_online_count |
| |
| 1: hlt |
| jmp 1b |
| |
| start32: |
| call load_tss |
| call mask_pic_interrupts |
| call enable_apic |
| call smp_init |
| call enable_x2apic |
| push $__environ |
| push $__argv |
| push __argc |
| call main |
| push %eax |
| call exit |
| |
| load_tss: |
| lidt idt_descr |
| mov $16, %eax |
| mov %ax, %ss |
| mov $(APIC_DEFAULT_PHYS_BASE + APIC_ID), %eax |
| mov (%eax), %eax |
| shr $24, %eax |
| mov %eax, %ebx |
| shl $3, %ebx |
| mov $((tss_end - tss) / max_cpus), %edx |
| imul %edx |
| add $tss, %eax |
| mov %ax, tss_descr+2(%ebx) |
| shr $16, %eax |
| mov %al, tss_descr+4(%ebx) |
| shr $8, %eax |
| mov %al, tss_descr+7(%ebx) |
| lea tss_descr-gdt32(%ebx), %eax |
| ltr %ax |
| ret |
| |
| smp_init: |
| cld |
| lea sipi_entry, %esi |
| xor %edi, %edi |
| mov $(sipi_end - sipi_entry), %ecx |
| rep/movsb |
| mov $APIC_DEFAULT_PHYS_BASE, %eax |
| movl $(APIC_DEST_ALLBUT | APIC_DEST_PHYSICAL | APIC_DM_INIT | APIC_INT_ASSERT), APIC_ICR(%eax) |
| movl $(APIC_DEST_ALLBUT | APIC_DEST_PHYSICAL | APIC_DM_INIT), APIC_ICR(%eax) |
| movl $(APIC_DEST_ALLBUT | APIC_DEST_PHYSICAL | APIC_DM_STARTUP), APIC_ICR(%eax) |
| call fwcfg_get_nb_cpus |
| 1: pause |
| cmpw %ax, cpu_online_count |
| jne 1b |
| smp_init_done: |
| ret |
| |
| cpu_online_count: .word 1 |
| |
| .code16 |
| sipi_entry: |
| mov %cr0, %eax |
| or $1, %eax |
| mov %eax, %cr0 |
| lgdtl gdt32_descr - sipi_entry |
| ljmpl $8, $ap_start32 |
| |
| gdt32_descr: |
| .word gdt32_end - gdt32 - 1 |
| .long gdt32 |
| |
| sipi_end: |