110 строки
2.8 KiB
ArmAsm
110 строки
2.8 KiB
ArmAsm
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/*
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Boot.S: boot loader for Siemens DVB-S card
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Copyright (C) 2001 Convergence integrated media GmbH
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Written by Ralph Metzler
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<rjkm@convergence.de>
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Copyright (C) 2006 Matthieu CASTET <castet.mattheiu@free.fr>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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check AV711x_3_1.pdf for some hardware infos
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build it with :
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$ cc -mbig-endian -c Boot.S
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$ ld -Ttext 0x2c000000 -EB -o Boot Boot.o
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$ objcopy -Obinary Boot
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*/
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.text
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.align
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.globl _start
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_start:
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b reset // reset vector
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movs pc, r14 // undefined
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subs pc, r14, #4 // SWI
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subs pc, r14, #4 // prefetch abort
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subs pc, r14, #8 // data abort
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subs pc, r14, #4 // reserved
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subs pc, r14, #4 // IRQ
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subs pc, r14, #4 // FIQ
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.word tbl // table needed by firmware ROM
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tbl: .word (endtbl - tbl)
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.word 0
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.word conf
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endtbl: .word 0
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conf: .word 0xa5a55a5a
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.word 0x001f1555
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.word 0x00000009
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reset: ldr r13, buffer
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ldr r4, flag
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mov r0, #0
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str r0, [r4]
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str r0, [r4, #4]
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ldr r1, wait_address
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ldr r2, flag_address
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ldr r3, sram
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copycode: // copy the code HW Sram
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ldmia r1!, {r5-r12}
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stmia r3!, {r5-r12}
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cmp r1, r2
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ble copycode
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ldr pc, sram // jump to the copied code
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wait: ldrh r1, [r4] // wait for flag!=0
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cmp r1, #0
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beq wait
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mov r1, r13 // buffer address
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ldr r3, [r4,#4] // destaddr
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ldrh r2, [r4,#2] // get segment length
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add r2, r2, #63 // round length to next 64 bytes
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movs r2, r2, lsr #6 // and divide by 64
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moveq r0, #2 // if 0, set flag to 2, else signal
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strh r0, [r4] // that buffer is accepted by setting to 0
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beq wait
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copyloop:
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ldmia r1!, {r5-r12}
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stmia r3!, {r5-r12}
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ldmia r1!, {r5-r12}
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stmia r3!, {r5-r12}
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subs r2, r2, #1
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bne copyloop
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eor r13, r13, #0x1400 // switch to other buffer
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b wait
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// flag is stored at 0x2c0003f8, length at 0x2c0003fa,
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// destaddr at 0x2c0003fc
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flag: .word 0x2c0003f8
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// buffer 1 is at 0x2c000400, buffer 2 at 0x2c001000
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buffer: .word 0x2c000400
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sram: .word 0x9e000800
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wait_address: .word wait
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flag_address: .word flag
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