mirror of
https://github.com/LNH-team/pico-loader.git
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82 lines
1.4 KiB
ArmAsm
82 lines
1.4 KiB
ArmAsm
.cpu arm7tdmi
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.syntax unified
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.section "r4idsn_writesd", "ax"
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.thumb
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// r0 = dst sector
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// r1 = src
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// r2 = sector count
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.global r4idsn_writeSd
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.type r4idsn_writeSd, %function
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r4idsn_writeSd:
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push {r4-r7,lr}
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ldr r4, =0x040001A0
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movs r3, #0x80
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strb r3, [r4,#1]
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sector_loop:
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.global r4idsn_writeSd_sdsc_shift
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r4idsn_writeSd_sdsc_shift:
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lsls r7, r0, #9
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push {r0-r1}
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// SDIO cmd
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ldr r0, =0x180005AB
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// param
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movs r1, r7
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ldr r6, r4idsn_writeSd_sendSdioCommand_address
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bl blx_r6
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pop {r0-r1}
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// NOW we can start writing things
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movs r7, #1
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lsls r7, r7, #9
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r4idsn_writeSd_block_write_loop:
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// start copy to MCCMD1
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ldmia r1!, {r5, r6}
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str r5, [r4, #0x8]
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str r6, [r4, #0xc]
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ldr r3, =0xA0406000
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str r3, [r4,#4]
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r4idsn_writeSd_block_write_wait_busy:
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ldr r3, [r4,#4]
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cmp r3, #0
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blt r4idsn_writeSd_block_write_wait_busy
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subs r7, r7, #8
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bne r4idsn_writeSd_block_write_loop
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push {r0-r1}
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// Wait for SD state
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movs r0, #4
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movs r1, #0
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ldr r6, r4idsn_writeSd_sdWaitForState_address
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bl blx_r6
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pop {r0-r1}
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adds r0, #1
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subs r2, #1
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bne sector_loop
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pop {r4-r7,pc}
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blx_r6:
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bx r6
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.balign 4
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.global r4idsn_writeSd_sendSdioCommand_address
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r4idsn_writeSd_sendSdioCommand_address:
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.word 0
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.global r4idsn_writeSd_sdWaitForState_address
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r4idsn_writeSd_sdWaitForState_address:
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.word 0
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.pool
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.end
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