51065a1b47
- gas2ack cannot handle all variants of some instructions. Until this issues is addressed, this patch places a big warning where appropriate. This code is not supposed to change frequently.
695 lines
16 KiB
ArmAsm
695 lines
16 KiB
ArmAsm
/* sections */
|
|
|
|
.text; .data; .data; .bss
|
|
|
|
#include <minix/config.h>
|
|
#include <minix/const.h>
|
|
#include <ibm/interrupt.h>
|
|
#include <archconst.h>
|
|
#include "../../const.h"
|
|
#include "sconst.h"
|
|
|
|
/*
|
|
* This file contains a number of assembly code utility routines needed by the
|
|
* kernel. They are:
|
|
*/
|
|
|
|
.globl monitor /* exit Minix and return to the monitor */
|
|
.globl int86 /* let the monitor make an 8086 interrupt call */
|
|
.globl exit /* dummy for library routines */
|
|
.globl _exit /* dummy for library routines */
|
|
.globl __exit /* dummy for library routines */
|
|
.globl __main /* dummy for GCC */
|
|
.globl phys_insw /* transfer data from (disk controller) port to memory */
|
|
.globl phys_insb /* likewise byte by byte */
|
|
.globl phys_outsw /* transfer data from memory to (disk controller) port */
|
|
.globl phys_outsb /* likewise byte by byte */
|
|
.globl phys_copy /* copy data from anywhere to anywhere in memory */
|
|
.globl phys_copy_fault /* phys_copy pagefault */
|
|
.globl phys_copy_fault_in_kernel /* phys_copy pagefault in kernel */
|
|
.globl phys_memset /* write pattern anywhere in memory */
|
|
.globl mem_rdw /* copy one word from [segment:offset] */
|
|
.globl reset /* reset the system */
|
|
.globl halt_cpu/* halts the current cpu when idle */
|
|
.globl level0 /* call a function at level 0 */
|
|
.globl read_cpu_flags /* read the cpu flags */
|
|
.globl read_cr0 /* read cr0 */
|
|
.globl read_cr2 /* read cr2 */
|
|
.globl getcr3val
|
|
.globl write_cr0 /* write a value in cr0 */
|
|
.globl read_cr4
|
|
.globl thecr3
|
|
.globl write_cr4
|
|
|
|
.globl catch_pagefaults
|
|
.globl read_ds
|
|
.globl read_cs
|
|
.globl read_ss
|
|
.globl idt_reload /* reload idt when returning to monitor. */
|
|
|
|
.globl fninit /* non-waiting FPU initialization */
|
|
.globl fnstsw /* store status word (non-waiting) */
|
|
.globl fnstcw /* store control word (non-waiting) */
|
|
|
|
/*
|
|
* The routines only guarantee to preserve the registers the C compiler
|
|
* expects to be preserved (ebx, esi, edi, ebp, esp, segment registers, and
|
|
* direction bit in the flags).
|
|
*/
|
|
|
|
.text
|
|
/*===========================================================================*/
|
|
/* monitor */
|
|
/*===========================================================================*/
|
|
/* PUBLIC void monitor(); */
|
|
/* Return to the monitor. */
|
|
|
|
monitor:
|
|
movl mon_sp, %esp /* restore monitor stack pointer */
|
|
movw $SS_SELECTOR, %dx /* monitor data segment */
|
|
mov %dx, %ds
|
|
mov %dx, %es
|
|
mov %dx, %fs
|
|
mov %dx, %gs
|
|
mov %dx, %ss
|
|
pop %edi
|
|
pop %esi
|
|
pop %ebp
|
|
lretw /* return to the monitor */
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* int86 */
|
|
/*===========================================================================*/
|
|
/* PUBLIC void int86(); */
|
|
int86:
|
|
cmpb $0, mon_return /* is the monitor there? */
|
|
jne 0f
|
|
movb $0x01, %ah /* an int 13 error seems appropriate */
|
|
movb %ah, reg86+0 /* reg86.w.f = 1 (set carry flag) */
|
|
movb %ah, reg86+13 /* reg86.b.ah = 0x01 = "invalid command" */
|
|
ret
|
|
0:
|
|
push %ebp /* save C registers */
|
|
push %esi
|
|
push %edi
|
|
push %ebx
|
|
pushf /* save flags */
|
|
cli /* no interruptions */
|
|
|
|
inb $INT2_CTLMASK
|
|
movb %al, %ah
|
|
inb $INT_CTLMASK
|
|
push %eax /* save interrupt masks */
|
|
movl irq_use, %eax /* map of in-use IRQ's */
|
|
and $~(1<<CLOCK_IRQ), %eax /* keep the clock ticking */
|
|
outb $INT_CTLMASK /* enable all unused IRQ's and vv. */
|
|
movb %ah, %al
|
|
outb $INT2_CTLMASK
|
|
|
|
mov $SS_SELECTOR, %eax /* monitor data segment */
|
|
mov %ax, %ss
|
|
xchgl mon_sp, %esp /* switch stacks */
|
|
push reg86+36 /* parameters used in INT call */
|
|
push reg86+32
|
|
push reg86+28
|
|
push reg86+24
|
|
push reg86+20
|
|
push reg86+16
|
|
push reg86+12
|
|
push reg86+8
|
|
push reg86+4
|
|
push reg86+0
|
|
mov %ax, %ds /* remaining data selectors */
|
|
mov %ax, %es
|
|
mov %ax, %fs
|
|
mov %ax, %gs
|
|
push %cs
|
|
push $return /* kernel return address and selector */
|
|
ljmpw *20+2*4+10*4+2*4(%esp)
|
|
return:
|
|
pop reg86+0
|
|
pop reg86+4
|
|
pop reg86+8
|
|
pop reg86+12
|
|
pop reg86+16
|
|
pop reg86+20
|
|
pop reg86+24
|
|
pop reg86+28
|
|
pop reg86+32
|
|
pop reg86+36
|
|
lgdt gdt+GDT_SELECTOR /* reload global descriptor table */
|
|
ljmp $CS_SELECTOR, $csinit
|
|
csinit:
|
|
mov $DS_SELECTOR, %eax
|
|
mov %ax, %ds
|
|
mov %ax, %es
|
|
mov %ax, %fs
|
|
mov %ax, %gs
|
|
mov %ax, %ss
|
|
xchgl mon_sp, %esp /* unswitch stacks */
|
|
lidt gdt+IDT_SELECTOR /* reload interrupt descriptor table */
|
|
|
|
#ifdef CONFIG_APIC
|
|
cmpl $0x0, lapic_addr
|
|
jne 3f
|
|
mov $0, %ebx
|
|
jmp 4f
|
|
|
|
3:
|
|
mov $FLAT_DS_SELECTOR, %ebx
|
|
mov %bx, %fs
|
|
movl lapic_addr, %eax
|
|
add $0x20, %eax
|
|
.byte 0x64; mov (%eax), %ebx
|
|
and $0xFF000000, %ebx
|
|
shr $24, %ebx
|
|
movzb %bl, %ebx
|
|
|
|
4:
|
|
add $apicid2cpuid, %ebx
|
|
movzb (%ebx), %eax
|
|
shl $3, %eax
|
|
mov %eax, %ebx
|
|
add $TSS_SELECTOR, %eax
|
|
addl gdt+DESC_ACCESS, %eax
|
|
and $~0x02, %eax
|
|
ltr %bx /* set TSS register */
|
|
|
|
mov $DS_SELECTOR, %eax
|
|
mov %ax, %fs
|
|
|
|
#endif /* CONFIG_APIC */
|
|
|
|
pop %eax
|
|
outb $INT_CTLMASK /* restore interrupt masks */
|
|
movb %ah, %al
|
|
outb $INT2_CTLMASK
|
|
|
|
6:
|
|
addl %ecx, lost_ticks /* record lost clock ticks */
|
|
|
|
popf /* restore flags */
|
|
pop %ebx /* restore C registers */
|
|
pop %edi
|
|
pop %esi
|
|
pop %ebp
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* exit */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void exit();
|
|
* Some library routines use exit, so provide a dummy version.
|
|
* Actual calls to exit cannot occur in the kernel.
|
|
* GNU CC likes to call ___main from main() for nonobvious reasons.
|
|
*/
|
|
|
|
exit:
|
|
_exit:
|
|
__exit:
|
|
sti
|
|
jmp __exit
|
|
|
|
__main:
|
|
ret
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* phys_insw */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void phys_insw(Port_t port, phys_bytes buf, size_t count);
|
|
* Input an array from an I/O port. Absolute address version of insw().
|
|
*/
|
|
|
|
phys_insw:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
cld
|
|
push %edi
|
|
push %es
|
|
|
|
mov $FLAT_DS_SELECTOR, %ecx
|
|
mov %cx, %es
|
|
mov 8(%ebp), %edx /* port to read from */
|
|
mov 12(%ebp), %edi /* destination addr */
|
|
mov 16(%ebp), %ecx /* byte count */
|
|
shr $1, %ecx /* word count */
|
|
rep insw /* input many words */
|
|
pop %es
|
|
pop %edi
|
|
pop %ebp
|
|
ret
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* phys_insb */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void phys_insb(Port_t port, phys_bytes buf, size_t count);
|
|
* Input an array from an I/O port. Absolute address version of insb().
|
|
*/
|
|
|
|
phys_insb:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
cld
|
|
push %edi
|
|
push %es
|
|
|
|
mov $FLAT_DS_SELECTOR, %ecx
|
|
mov %cx, %es
|
|
mov 8(%ebp), %edx /* port to read from */
|
|
mov 12(%ebp), %edi /* destination addr */
|
|
mov 16(%ebp), %ecx /* byte count */
|
|
rep insb /* input many bytes */
|
|
pop %es
|
|
pop %edi
|
|
pop %ebp
|
|
ret
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* phys_outsw */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void phys_outsw(Port_t port, phys_bytes buf, size_t count);
|
|
* Output an array to an I/O port. Absolute address version of outsw().
|
|
*/
|
|
|
|
.balign 16
|
|
phys_outsw:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
cld
|
|
push %esi
|
|
push %ds
|
|
|
|
mov $FLAT_DS_SELECTOR, %ecx
|
|
mov %cx, %ds
|
|
mov 8(%ebp), %edx /* port to write to */
|
|
mov 12(%ebp), %esi /* source addr */
|
|
mov 16(%ebp), %ecx /* byte count */
|
|
shr $1, %ecx /* word count */
|
|
rep outsw /* output many words */
|
|
pop %ds
|
|
pop %esi
|
|
pop %ebp
|
|
ret
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* phys_outsb */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void phys_outsb(Port_t port, phys_bytes buf, size_t count);
|
|
* Output an array to an I/O port. Absolute address version of outsb().
|
|
*/
|
|
|
|
.balign 16
|
|
phys_outsb:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
cld
|
|
push %esi
|
|
push %ds
|
|
|
|
mov $FLAT_DS_SELECTOR, %ecx
|
|
mov %cx, %ds
|
|
mov 8(%ebp), %edx /* port to write to */
|
|
mov 12(%ebp), %esi /* source addr */
|
|
mov 16(%ebp), %ecx /* byte count */
|
|
rep outsb /* output many bytes */
|
|
pop %ds
|
|
pop %esi
|
|
pop %ebp
|
|
ret
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* phys_copy */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC phys_bytes phys_copy(phys_bytes source, phys_bytes destination,
|
|
* phys_bytes bytecount);
|
|
* Copy a block of physical memory.
|
|
*/
|
|
|
|
PC_ARGS = 4+4+4+4 /* 4 + 4 + 4 */
|
|
/* es edi esi eip src dst len */
|
|
|
|
.balign 16
|
|
phys_copy:
|
|
cld
|
|
push %esi
|
|
push %edi
|
|
push %es
|
|
|
|
mov $FLAT_DS_SELECTOR, %eax
|
|
mov %ax, %es
|
|
|
|
mov PC_ARGS(%esp), %esi
|
|
mov PC_ARGS+4(%esp), %edi
|
|
mov PC_ARGS+4+4(%esp), %eax
|
|
|
|
cmp $10, %eax /* avoid align overhead for small counts */
|
|
jb pc_small
|
|
mov %esi, %ecx /* align source, hope target is too */
|
|
neg %ecx
|
|
and $3, %ecx /* count for alignment */
|
|
sub %ecx, %eax
|
|
|
|
rep movsb %es:(%esi), %es:(%edi)
|
|
mov %eax, %ecx
|
|
shr $2, %ecx /* count of dwords */
|
|
|
|
rep movsl %es:(%esi), %es:(%edi)
|
|
and $3, %eax
|
|
pc_small:
|
|
xchg %eax, %ecx /* remainder */
|
|
|
|
rep movsb %es:(%esi), %es:(%edi)
|
|
|
|
mov $0, %eax /* 0 means: no fault */
|
|
phys_copy_fault: /* kernel can send us here */
|
|
pop %es
|
|
pop %edi
|
|
pop %esi
|
|
ret
|
|
|
|
phys_copy_fault_in_kernel: /* kernel can send us here */
|
|
pop %es
|
|
pop %edi
|
|
pop %esi
|
|
mov %cr2, %eax
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* phys_memset */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void phys_memset(phys_bytes source, unsigned long pattern,
|
|
* phys_bytes bytecount);
|
|
* Fill a block of physical memory with pattern.
|
|
*/
|
|
|
|
.balign 16
|
|
phys_memset:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
push %esi
|
|
push %ebx
|
|
push %ds
|
|
|
|
mov 8(%ebp), %esi
|
|
mov 16(%ebp), %eax
|
|
mov $FLAT_DS_SELECTOR, %ebx
|
|
mov %bx, %ds
|
|
mov 12(%ebp), %ebx
|
|
shr $2, %eax
|
|
fill_start:
|
|
mov %ebx, (%esi)
|
|
add $4, %esi
|
|
dec %eax
|
|
jne fill_start
|
|
/* Any remaining bytes? */
|
|
mov 16(%ebp), %eax
|
|
and $3, %eax
|
|
remain_fill:
|
|
cmp $0, %eax
|
|
je fill_done
|
|
movb 12(%ebp), %bl
|
|
movb %bl, (%esi)
|
|
add $1, %esi
|
|
inc %ebp
|
|
dec %eax
|
|
jmp remain_fill
|
|
fill_done:
|
|
pop %ds
|
|
pop %ebx
|
|
pop %esi
|
|
pop %ebp
|
|
ret
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* mem_rdw */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC u16_t mem_rdw(U16_t segment, u16_t *offset);
|
|
* Load and return word at far pointer segment:offset.
|
|
*/
|
|
|
|
.balign 16
|
|
mem_rdw:
|
|
mov %ds, %cx
|
|
mov 4(%esp), %ds
|
|
mov 4+4(%esp), %eax /* offset */
|
|
movzwl (%eax), %eax /* word to return */
|
|
mov %cx, %ds
|
|
ret
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* reset */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void reset();
|
|
* Reset the system by loading IDT with offset 0 and interrupting.
|
|
*/
|
|
|
|
reset:
|
|
lidt idt_zero
|
|
int $3 /* anything goes, the 386 will not like it */
|
|
.data
|
|
idt_zero:
|
|
.long 0, 0
|
|
.text
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* halt_cpu */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void halt_cpu(void);
|
|
* reanables interrupts and puts the cpu in the halts state. Once an interrupt
|
|
* is handled the execution resumes by disabling interrupts and continues
|
|
*/
|
|
halt_cpu:
|
|
sti
|
|
hlt
|
|
cli
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* level0 */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC void level0(void (*func)(void))
|
|
* Call a function at permission level 0. This allows kernel tasks to do
|
|
* things that are only possible at the most privileged CPU level.
|
|
*/
|
|
level0:
|
|
/* check whether we are already running in kernel, the kernel cs
|
|
* selector has 3 lower bits zeroed */
|
|
mov %cs, %ax
|
|
cmpw $CS_SELECTOR, %ax
|
|
jne 0f
|
|
|
|
/* call the function directly as if it was a normal function call */
|
|
mov 4(%esp), %eax
|
|
call *%eax
|
|
ret
|
|
|
|
|
|
/* if not runnig in the kernel yet, trap to kernel */
|
|
0:
|
|
mov 4(%esp), %eax
|
|
int $LEVEL0_VECTOR
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* read_flags */
|
|
/*===========================================================================*/
|
|
/*
|
|
* PUBLIC unsigned long read_cpu_flags(void);
|
|
* Read CPU status flags from C.
|
|
*/
|
|
.balign 16
|
|
read_cpu_flags:
|
|
pushf
|
|
mov (%esp), %eax
|
|
add $4, %esp
|
|
ret
|
|
|
|
read_ds:
|
|
mov $0, %eax
|
|
mov %ds, %ax
|
|
ret
|
|
|
|
read_cs:
|
|
mov $0, %eax
|
|
mov %cs, %ax
|
|
ret
|
|
|
|
read_ss:
|
|
mov $0, %eax
|
|
mov %ss, %ax
|
|
ret
|
|
|
|
|
|
/*===========================================================================*/
|
|
/* fpu_routines */
|
|
/*===========================================================================*/
|
|
fninit:
|
|
fninit
|
|
ret
|
|
|
|
fnstsw:
|
|
xor %eax, %eax
|
|
|
|
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
|
|
fnstsw %ax
|
|
ret
|
|
|
|
fnstcw:
|
|
push %eax
|
|
mov 8(%esp), %eax
|
|
|
|
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
|
|
fnstcw (%eax)
|
|
pop %eax
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* read_cr0 */
|
|
/*===========================================================================*/
|
|
/* PUBLIC unsigned long read_cr0(void); */
|
|
read_cr0:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
mov %cr0, %eax
|
|
pop %ebp
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* write_cr0 */
|
|
/*===========================================================================*/
|
|
/* PUBLIC void write_cr0(unsigned long value); */
|
|
write_cr0:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
mov 8(%ebp), %eax
|
|
mov %eax, %cr0
|
|
jmp 0f /* A jump is required for some flags */
|
|
0:
|
|
pop %ebp
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* read_cr2 */
|
|
/*===========================================================================*/
|
|
/* PUBLIC reg_t read_cr2(void); */
|
|
read_cr2:
|
|
mov %cr2, %eax
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* read_cr4 */
|
|
/*===========================================================================*/
|
|
/* PUBLIC unsigned long read_cr4(void); */
|
|
read_cr4:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
|
|
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
|
|
mov %cr4, %eax
|
|
pop %ebp
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* write_cr4 */
|
|
/*===========================================================================*/
|
|
/* PUBLIC void write_cr4(unsigned long value); */
|
|
write_cr4:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
mov 8(%ebp), %eax
|
|
|
|
/* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */
|
|
mov %eax, %cr4
|
|
jmp 0f
|
|
0:
|
|
pop %ebp
|
|
ret
|
|
/*===========================================================================*/
|
|
/* getcr3val */
|
|
/*===========================================================================*/
|
|
/* PUBLIC unsigned long getcr3val(void); */
|
|
getcr3val:
|
|
mov %cr3, %eax
|
|
mov %eax, thecr3
|
|
ret
|
|
|
|
/*
|
|
* Read the Model Specific Register (MSR) of IA32 architecture
|
|
*
|
|
* void ia32_msr_read(u32_t reg, u32_t * hi, u32_t * lo)
|
|
*/
|
|
.globl ia32_msr_read
|
|
ia32_msr_read:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
|
|
mov 8(%ebp), %ecx
|
|
rdmsr
|
|
mov 12(%ebp), %ecx
|
|
mov %edx, (%ecx)
|
|
mov 16(%ebp), %ecx
|
|
mov %eax, (%ecx)
|
|
|
|
pop %ebp
|
|
ret
|
|
|
|
/*
|
|
* Write the Model Specific Register (MSR) of IA32 architecture
|
|
*
|
|
* void ia32_msr_write(u32_t reg, u32_t hi, u32_t lo)
|
|
*/
|
|
.globl ia32_msr_write
|
|
ia32_msr_write:
|
|
push %ebp
|
|
mov %esp, %ebp
|
|
|
|
mov 12(%ebp), %edx
|
|
mov 16(%ebp), %eax
|
|
mov 8(%ebp), %ecx
|
|
wrmsr
|
|
|
|
pop %ebp
|
|
ret
|
|
|
|
/*===========================================================================*/
|
|
/* idt_reload */
|
|
/*===========================================================================*/
|
|
/* PUBLIC void idt_reload (void); */
|
|
.balign 16
|
|
idt_reload:
|
|
lidt gdt+IDT_SELECTOR /* reload interrupt descriptor table */
|
|
ret
|
|
|
|
/*
|
|
* void reload_segment_regs(void)
|
|
*/
|
|
|
|
#define RELOAD_SEG_REG(reg) \
|
|
mov reg, %ax ;\
|
|
mov %ax, reg ;
|
|
|
|
.globl reload_ds
|
|
reload_ds:
|
|
RELOAD_SEG_REG(%ds)
|
|
ret
|