133 lines
1.8 KiB
ArmAsm
133 lines
1.8 KiB
ArmAsm
.code32
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.section .text
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.global disable_interrupts
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disable_interrupts:
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cli
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ret
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.global enable_interrupts
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enable_interrupts:
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sti
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ret
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.global io_wait
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io_wait:
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outb %al, $0x80
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ret
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.global liftoff
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liftoff:
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cli
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mov 4(%esp), %ecx
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mov 8(%esp), %ebx
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mov $0x23, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %fs
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mov %ax, %gs
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pushl $0x23 # User Data Segment (SS)
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pushl %ebx # User Stack Pointer (ESP)
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pushl $0x202 # EFLAGS (Interrupts enabled, bit 1 standard)
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pushl $0x1B # User Code Segment (CS)
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pushl %ecx # User Entry Point (EIP)
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xor %eax, %eax
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xor %ebx, %ebx
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xor %ecx, %ecx
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xor %edx, %edx
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xor %esi, %esi
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xor %edi, %edi
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xor %ebp, %ebp
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iret
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.global outb
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outb:
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push %ebp
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mov %esp, %ebp
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# 8(%ebp) port
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# 12(%ebp) data
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mov 8(%ebp), %edx
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mov 12(%ebp), %eax
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outb %al, %dx
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leave
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ret
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.global inb
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inb:
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push %ebp
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mov %esp, %ebp
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# 8(%ebp) port
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mov 8(%ebp), %edx
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xor %eax, %eax
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inb %dx, %al
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leave
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ret
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.global insw
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insw:
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push %ebp
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mov %esp, %ebp
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push %edi
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push %ecx
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push %edx
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# 8(%ebp) addr
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# 12(%ebp) buf
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# 16(%ebp) sz
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mov 8(%ebp), %edx
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mov 12(%ebp), %edi
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mov 16(%ebp), %ecx
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cld
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rep insw
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pop %edx
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pop %ecx
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pop %edi
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leave
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ret
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.global outsw
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outsw:
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push %ebp
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mov %esp, %ebp
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push %esi
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push %ecx
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push %edx
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# 8(%ebp) address
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# 12(%ebp) buf
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# 16(%ebp) sz
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mov 8(%ebp), %edx
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mov 12(%ebp), %esi
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mov 16(%ebp), %ecx
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cld
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rep outsw
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pop %edx
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pop %ecx
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pop %esi
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leave
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ret
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.global fetch_cr3
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fetch_cr3:
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mov %cr3, %eax
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ret
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.global kpanic
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kpanic:
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cli
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hlt |