8f9900103f
the mmu example. Not sure how this worked before it was set for an address of 0 not 0x8000
103 lines
2.7 KiB
ArmAsm
103 lines
2.7 KiB
ArmAsm
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;@-------------------------------------------------------------------------
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;@-------------------------------------------------------------------------
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;@.globl _start
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;@_start:
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b reset
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.globl reset
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reset:
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mov sp,#0x10000
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bl notmain
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hang: b hang
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.globl PUT32
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PUT32:
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str r1,[r0]
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bx lr
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.globl GET32
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GET32:
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ldr r0,[r0]
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bx lr
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.globl dummy
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dummy:
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bx lr
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.globl LDREX
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LDREX:
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ldrex r0,[r1]
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bx lr
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.globl STREX
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STREX:
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strex r0,r1,[r2]
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bx lr
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.globl EXTEST
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EXTEST:
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ldrex r3,[r2]
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strex r0,r1,[r2]
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bx lr
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.globl start_l1cache
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start_l1cache:
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mov r0, #0
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mcr p15, 0, r0, c7, c7, 0 ;@ invalidate caches
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mcr p15, 0, r0, c8, c7, 0 ;@ invalidate tlb
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mcr p15, 0, r2, c7,c10, 4 ;@ DSB ??
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mrc p15, 0, r0, c1, c0, 0
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orr r0,r0,#0x1000 ;@ instruction
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orr r0,r0,#0x0004 ;@ data
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mcr p15, 0, r0, c1, c0, 0
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bx lr
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.globl stop_l1cache
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stop_l1cache:
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mrc p15, 0, r0, c1, c0, 0
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bic r0,r0,#0x1000 ;@ instruction
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bic r0,r0,#0x0004 ;@ data
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mcr p15, 0, r0, c1, c0, 0
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bx lr
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.globl start_mmu
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start_mmu:
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mov r2,#0
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mcr p15,0,r2,c7,c7,0 ;@ invalidate caches
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mcr p15,0,r2,c8,c7,0 ;@ invalidate tlb
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mvn r2,#0
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mcr p15,0,r2,c3,c0,0 ;@ domain
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mcr p15,0,r0,c2,c0,0 ;@ tlb base
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mcr p15,0,r0,c2,c0,1 ;@ tlb base
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mrc p15,0,r2,c1,c0,0
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orr r2,r2,r1
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mcr p15,0,r2,c1,c0,0
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bx lr
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;@-------------------------------------------------------------------------
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;@-------------------------------------------------------------------------
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;@-------------------------------------------------------------------------
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;@
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;@ Copyright (c) 2012 David Welch dwelch@dwelch.com
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;@
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;@ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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;@
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;@ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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;@
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;@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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;@
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;@-------------------------------------------------------------------------
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