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#include "linux_config.h" .arm .align 4 .code 32 .text @ LCD Frambuffers stuff (Physical Addresses) #define LCD_FB_PDC0 (0x10400400) #define LCD_FB_PDC1 (0x10400500) #define LCD_FB_A_ADDR_OFFSET (0x68) #define LCD_FB_B_ADDR_OFFSET (0x94) #define FB_TOP_SIZE (400*240*3) #define FB_BOT_SIZE (320*240*3) #define FB_TOP_LEFT1 (VRAM_BASE) #define FB_TOP_LEFT2 (FB_TOP_LEFT1 + FB_TOP_SIZE) #define FB_TOP_RIGHT1 (FB_TOP_LEFT2 + FB_TOP_SIZE) #define FB_TOP_RIGHT2 (FB_TOP_RIGHT1 + FB_TOP_SIZE) #define FB_BOT_1 (FB_TOP_RIGHT2 + FB_TOP_SIZE) #define FB_BOT_2 (FB_BOT_1 + FB_BOT_SIZE) @ This must be Position-independent Code .cpu arm946e-s .global linux_payloads_start linux_payloads_start: _start: b _init @ required, don't move :) @ will be set to FIRM ARM9 entry point by BRAHMA arm9ep_backup: .long 0xFFFF0000 _init: stmfd sp!, {r0-r12, lr} bl linux_arm9_stage_start ldmfd sp!, {r0-r12, lr} @ return control to FIRM ldr pc, arm9ep_backup @@@@@@@@@@@@ ARM9 Stage 0 @@@@@@@@@@@@ linux_arm9_stage_start: @ Disable MPU mrc p15, 0, r0, c1, c0, 0 bic r0, r0, #1 mcr p15, 0, r0, c1, c0, 0 @ Disable IRQ and FIQ mrs r0, cpsr orr r0, r0, #(0x80 | 0x40) msr cpsr_c, r0 ldr r0, =SHARED_CHAR mov r1, #0 str r1, [r0] @ The ARM9 code is loaded to 0x23F00000 so the @ linux_arm11_stage_start address will be at: @ 0x23F00000 + (&linux_arm11_stage_start - &linux_arm9_stage_start) ldr r0, =PA_ARM11_CODE_ADDR ldr r1, =(0x23F0002C) str r1, [r0] //Drain write buffer mcr p15, 0, r0, c7, c10, 4 //Map VRAM to region 7 //Region base: 0x18000000 //Region size: 8MB (0b10110) ldr r0, =0x1800002D mcr p15, 0, r0, c6, c7, 0 //Set region 7 permissions: //Privileged: Read/write access //User: Read/write access mrc p15, 0, r0, c5, c0, 2 bic r0, r0, #(0b1111 << 28) orr r0, r0, #(0b0011 << 28) mcr p15, 0, r0, c5, c0, 2 loop: @ Draw fbs ldr r0, =0xFF00FF bl fill_screen b loop .global fill_screen @ r0 = color fill_screen: mov r9, r0 and r3, r0, #0xFF lsr r4, r0, #8 and r4, r4, #0xFF lsr r5, r0, #16 and r5, r5, #0xFF ldr r0, =(FB_TOP_SIZE/2) ldr r1, =FB_TOP_LEFT1 ldr r7, =(FB_TOP_LEFT2-FB_TOP_LEFT1) add r2, r1, r0 @limit_addr mov r6, r1 @ ptr _fill_for_1: strb r3, [r6, #0] strb r4, [r6, #1] strb r5, [r6, #2] add r8, r6, r7 strb r3, [r8, #0] strb r4, [r8, #1] strb r5, [r8, #2] add r6, r6, #3 cmp r6, r2 blt _fill_for_1 mov r0, r9 and r3, r0, #0xFF lsr r4, r0, #8 and r4, r4, #0xFF lsr r5, r0, #16 and r5, r5, #0xFF ldr r0, =(FB_TOP_SIZE/2) ldr r1, =FB_TOP_RIGHT1 ldr r7, =(FB_TOP_RIGHT2-FB_TOP_RIGHT1) add r2, r1, r0 @limit_addr mov r6, r1 @ ptr _fill_for_2: strb r3, [r6, #0] strb r4, [r6, #1] strb r5, [r6, #2] add r8, r6, r7 strb r3, [r8, #0] strb r4, [r8, #1] strb r5, [r8, #2] add r6, r6, #3 cmp r6, r2 blt _fill_for_2 bx lr .ltorg .global linux_arm9_stage_end linux_arm9_stage_end: .cpu mpcore .global linux_arm11_stage_start linux_arm11_stage_start: @ Disable FIQs, IRQs, @ imprecise aborts, @ and enter SVC mode CPSID aif, #0x13 @ Invalidate Entire Instruction Cache, @ also flushes the branch target cache mov r0, #0 mcr p15, 0, r0, c7, c5, 0 @ Invalidate Entire Data Cache mov r0, #0 mcr p15, 0, r0, c7, c6, 0 @ Clear exclusive records clrex @ Map FBs to the VRAM @ Top screen ldr r0, =LCD_FB_PDC0 @ Left eye ldr r1, =FB_TOP_LEFT1 str r1, [r0, #(LCD_FB_A_ADDR_OFFSET + 0)] ldr r1, =FB_TOP_LEFT2 str r1, [r0, #(LCD_FB_A_ADDR_OFFSET + 4)] @ Right eye ldr r1, =FB_TOP_RIGHT1 str r1, [r0, #(LCD_FB_B_ADDR_OFFSET + 0)] ldr r1, =FB_TOP_RIGHT2 str r1, [r0, #(LCD_FB_B_ADDR_OFFSET + 4)] @ Bottom screen ldr r0, =LCD_FB_PDC1 ldr r1, =FB_BOT_1 str r1, [r0, #(LCD_FB_A_ADDR_OFFSET + 0)] ldr r1, =FB_BOT_2 str r1, [r0, #(LCD_FB_A_ADDR_OFFSET + 4)] @ Setup the registers before @ jumping to the kernel entry mov r0, #0 ldr r1, =MACHINE_NUMBER ldr r2, =PARAMS_ADDR ldr lr, =ZIMAGE_ADDR bx lr .ltorg .global linux_arm11_stage_end linux_arm11_stage_end: .global linux_payloads_end linux_payloads_end:
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