164 lines
3.8 KiB
ArmAsm
164 lines
3.8 KiB
ArmAsm
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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memorymanagement-asm.s
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Handles memory for the x86 architecture.
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******************************************************************************/
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.section .text
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.globl _ZN6Sortix4Page11FragmentizeEv
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.type _ZN6Sortix4Page11FragmentizeEv, @function # namespace Sortix { namespace Page { void Fragmentize(); } }
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_ZN6Sortix4Page11FragmentizeEv:
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# Load the front of our linked list.
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movq _ZN6Sortix4Page15UnallocatedPageE, %rax # Load UnallocPage* Sortix::Page::UnallocatedPage
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FragLoop:
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testq %rax, %rax
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je FragDone
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movq 8(%rax), %rdx
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movq 16(%rax), %rbx
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testq %rbx, %rbx
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je FragNext
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movq %rax, %rcx
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addq $0x1000, %rcx
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movq %rcx, 8(%rax)
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decq %rbx
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FragFixupLoop:
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testq %rbx, %rbx
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je FragFixupLoopLastSwap
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movl $0xABBAACDC, 0(%rcx)
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addq $0x2000, %rax
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movq %rax, 8(%rcx)
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#movq $0, 16(%rcx)
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decq %rbx
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testq %rbx, %rbx
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je FragFixupLoopLast
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movl $0xABBAACDC, 0(%rax)
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addq $0x2000, %rcx
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movq %rcx, 8(%rax)
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#movq $0, 16(%rax)
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decq %rbx
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jmp FragFixupLoop
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FragFixupLoopLastSwap:
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movq %rcx, %rax
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FragFixupLoopLast:
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movl $0xABBAACDC, 0(%rax)
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movq %rdx, 8(%rax)
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FragNext:
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movq %rdx, %rax
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jmp FragLoop
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FragDone:
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ret
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.globl _ZN6Sortix4Page3GetEv
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.type _ZN6Sortix4Page3GetEv, @function # namespace Sortix { void Paging::Allocate(); }
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_ZN6Sortix4Page3GetEv:
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# Load the front of our linked list.
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movq _ZN6Sortix4Page15UnallocatedPageE, %rax # Load UnallocPage* Sortix::Page::UnallocatedPage
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# Test if we are out of memory.
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testq %rax, %rax
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je OutOfMem
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push %rbx
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push %rdi
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push %rsi
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# Disable virtual memory
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movq %cr0, %rdi
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movq %rdi, %rsi
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movabs $0xffffffff7fffffff, %rbx
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andq %rbx, %rsi
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movq %rsi, %cr0
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# Test if this page is unallocated, as a security measure.
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movl (%rax), %ebx
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cmpl $0xABBAACDC, %ebx
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jne MagicFailure
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# Prepare the next front element in our linked list.
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movq 8(%rax), %rdx
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jmp Done
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MagicFailure:
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# The magic header in our page was invalid!
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movq %rax, %rdx
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inc %rax # Set the lowest bit to signal a magic failure.
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# Panic the kernel.
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mov %rdx, %rsi
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mov %rbx, %rdx
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mov MagicFailureString, %rdi
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call PanicF
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Done:
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# Enable virtual memory here
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mov %rdi, %cr0
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# Update the front of our linked list to the next element.
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mov %rdx, _ZN6Sortix4Page15UnallocatedPageE # Save Load UnallocPage* Sortix::Page::UnallocatedPage
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ret
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OutOfMem:
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# We run out of memory. Return NULL.
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movq $0, %rax
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ret
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.globl _ZN6Sortix4Page3PutEPv
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.type _ZN6Sortix4Page3PutEPv, @function # namespace Sortix { void Paging::Free(void* Page); }
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_ZN6Sortix4Page3PutEPv:
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movq _ZN6Sortix4Page15UnallocatedPageE, %rax # Load UnallocPage* Sortix::Page::UnallocatedPage
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# Disable virtual memory
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movq %cr0, %rcx
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movq %rcx, %rsi
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movabs $0xffffffff7fffffff, %rbx
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andq %rbx, %rsi
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movq %rsi, %cr0
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movl $0xABBAACDC, (%rdi)
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movq %rax, 8(%edx)
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#movl $0, 16(%edx)
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# Enable virtual memory
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movq %rcx, %cr0
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# Update the front of our linked list to the next element.
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movq %rdx, _ZN6Sortix4Page15UnallocatedPageE # Save Load UnallocPage* Sortix::Page::UnallocatedPage
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ret
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.section .data
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MagicFailureString:
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.asciz "A magic failure occured at 0x%p, where 0x%x was found instead of 0xABBAACDC!\n"
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