📄 hal_platform_setup.h
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ldr r7,=MMU_L2_TYPE_Small|MMU_AP_Any|MMU_Bufferable|MMU_Cacheable;\ orr r6,r6,r7 ;\ ldr r7,=MMU_PAGE_SIZE ;\ str r6,[r2],#4 /* Next page */ ;\ add r3,r3,r7 ;\ add r5,r5,r7 ;\ ldr r8,=DRAM_LA_START+MMU_SECTION_SIZE ;\ cmp r3,r8 /* Done with first 1M? */ ;\ beq 20f ;\ ldr r7,=0x40000 /* Special check for 256K boundary */ ;\ and r7,r7,r5 ;\ cmp r7,#0 ;\ beq 10b ;\ add r5,r5,r7 /* Skip 256K hole */ ;\ ldr r7,=0x100000 ;\ and r7,r5,r7 ;\ beq 10b ;\ add r5,r5,r7 /* Nothing at 0xC0100000 */ ;\ ldr r7,=0x400000 /* Also nothing at 0xC0400000 */ ;\ and r7,r5,r7 ;\ beq 10b ;\ add r5,r5,r7 ;\ b 10b ;\20: ;\/* 0x00100000..0x001FFFFF */ ;\ mov r6,r2 /* Set up page table descriptor */ ;\ ldr r7,=MMU_L1_TYPE_Page ;\ orr r6,r6,r7 ;\ str r6,[r1],#4 /* Store PTE, update pointer */ ;\10: mov r6,r5 /* Build page table entry */ ;\ ldr r7,=MMU_L2_TYPE_Small|MMU_AP_Any|MMU_Bufferable|MMU_Cacheable;\ orr r6,r6,r7 ;\ ldr r7,=MMU_PAGE_SIZE ;\ str r6,[r2],#4 /* Next page */ ;\ add r3,r3,r7 ;\ cmp r3,r4 /* Done with first DRAM? */ ;\ beq 20f ;\ add r5,r5,r7 ;\ ldr r7,=0x40000 /* Special check for 256K boundary */ ;\ and r7,r7,r5 ;\ cmp r7,#0 ;\ beq 10b ;\ add r5,r5,r7 /* Skip 256K hole */ ;\ ldr r7,=0x100000 ;\ and r7,r5,r7 ;\ beq 10b ;\ add r5,r5,r7 /* Nothing at 0xC0300000 */ ;\ ldr r7,=0x400000 /* Also nothing at 0xC0400000 */ ;\ and r7,r5,r7 ;\ beq 10b ;\ add r5,r5,r7 ;\ b 10b ;\20:#elif (CYGHWR_HAL_ARM_EDB7XXX_DRAM_SIZE == 16)// The 16M board is arranged as:// 0xC0000000..0xC07FFFFF// 0xC1000000..0xC17FFFFF#define MAP_DRAM \/* Map DRAM */ ;\ ldr r3,=DRAM_LA_START ;\ ldr r4,=DRAM_LA_END ;\ ldr r5,=DRAM_PA ;\/* 0xXXX00000..0xXXXFFFFF */ ;\10: mov r6,r2 /* Set up page table descriptor */ ;\ ldr r7,=MMU_L1_TYPE_Page ;\ orr r6,r6,r7 ;\ str r6,[r1],#4 /* Store PTE, update pointer */ ;\ ldr r8,=MMU_SECTION_SIZE/MMU_PAGE_SIZE ;\ ldr r9,=DRAM_PA_START+0x00800000 /* Skip at 8M boundary */ ;\12: cmp r5,r9 ;\ bne 15f ;\ ldr r5,=DRAM_PA_START+0x01000000 /* Next chunk of DRAM */ ;\15: mov r6,r5 /* Build page table entry */ ;\ ldr r7,=MMU_L2_TYPE_Small|MMU_AP_Any|MMU_Bufferable|MMU_Cacheable;\ orr r6,r6,r7 ;\ ldr r7,=MMU_PAGE_SIZE ;\ str r6,[r2],#4 /* Next page */ ;\ add r3,r3,r7 ;\ add r5,r5,r7 ;\ cmp r3,r4 /* End of DRAM? */ ;\ beq 20f ;\ sub r8,r8,#1 /* End of 1M section? */ ;\ cmp r8,#0 ;\ bne 12b /* Next page */ ;\ b 10b /* Next section */ ;\20:#else#err Invalid DRAM size select#endif#define PLATFORM_SETUP1 \ INIT_MEMORY_CONFIG ;\/* Initialize MMU to create new memory map */ ;\ ldr r1,=MMU_BASE ;\ ldr r2,=PTE_BASE ;\ MAP_DRAM ;\/* Nothing until PCMCIA0 */ ;\ ldr r3,=0x3FF /* Page tables need 2K boundary */ ;\ add r2,r2,r3 ;\ ldr r3,=~0x3FF ;\ and r2,r2,r3 ;\ ldr r3,=(DRAM_LA_END+0x000FFFFF)&0xFFF00000 ;\ ldr r4,=EXPANSION2_LA_START ;\ ldr r5,=MMU_L1_TYPE_Fault ;\ ldr r7,=MMU_SECTION_SIZE ;\10: str r5,[r1],#4 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 10b ;\/* EXPANSION2, EXPANSION3, PCMCIA0, PCMCIA1 */ ;\ ldr r3,=EXPANSION2_LA_START ;\ ldr r4,=SRAM_LA_START ;\ ldr r5,=EXPANSION2_PA ;\ ldr r6,=MMU_L1_TYPE_Section|MMU_AP_Any ;\ ldr r7,=MMU_SECTION_SIZE ;\10: orr r0,r5,r6 ;\ str r0,[r1],#4 ;\ add r5,r5,r7 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 10b ;\/* SRAM */ ;\ ldr r3,=SRAM_LA_START ;\ ldr r4,=MMU_L1_TYPE_Page|MMU_DOMAIN(0) ;\ orr r4,r4,r2 ;\ str r4,[r1],#4 ;\ ldr r4,=MMU_L2_TYPE_Small|MMU_AP_Any|MMU_Bufferable|MMU_Cacheable;\ orr r4,r3,r4 ;\ str r4,[r2],#4 ;\ ldr r3,=SRAM_LA_START+MMU_PAGE_SIZE ;\ ldr r4,=SRAM_LA_START+MMU_SECTION_SIZE ;\ ldr r5,=MMU_L2_TYPE_Fault ;\ ldr r7,=MMU_PAGE_SIZE ;\10: str r5,[r2],#4 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 10b ;\ ldr r4,=IO_LA_START ;\ ldr r5,=MMU_L1_TYPE_Fault ;\ ldr r7,=MMU_SECTION_SIZE ;\20: str r5,[r1],#4 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 20b ;\/* I/O */ ;\ ldr r3,=0x3FF /* Page tables need 2K boundary */ ;\ add r2,r2,r3 ;\ ldr r3,=~0x3FF ;\ and r2,r2,r3 ;\ ldr r4,=MMU_L1_TYPE_Page|MMU_DOMAIN(0) ;\ orr r4,r4,r2 ;\ str r4,[r1],#4 ;\ ldr r3,=IO_LA_START ;\ ldr r4,=IO_LA_END ;\ ldr r7,=MMU_PAGE_SIZE ;\ ldr r5,=IO_PA|MMU_L2_TYPE_Small|MMU_AP_All ;\10: str r5,[r2],#4 ;\ add r5,r5,r7 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 10b ;\ ldr r4,=IO_LA_START+MMU_SECTION_SIZE ;\ ldr r5,=MMU_L2_TYPE_Fault ;\ ldr r7,=MMU_PAGE_SIZE ;\10: str r5,[r2],#4 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 10b ;\ ldr r4,=LCD_LA_START ;\ ldr r5,=MMU_L1_TYPE_Fault ;\ ldr r7,=MMU_SECTION_SIZE ;\20: str r5,[r1],#4 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 20b ;\/* LCD Buffer & Unmapped DRAM (holes and all) */ ;\ ldr r3,=LCD_LA_START ;\ ldr r4,=ROM0_LA_START ;\ ldr r5,=LCD_PA ;\ ldr r6,=MMU_L1_TYPE_Section|MMU_AP_Any \ |MMU_Bufferable|MMU_Cacheable ;\ ldr r7,=MMU_SECTION_SIZE ;\10: orr r0,r5,r6 ;\ str r0,[r1],#4 ;\ add r5,r5,r7 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 10b ;\/* ROM0 */ ;\ ldr r3,=ROM0_LA_START ;\ ldr r4,=ROM0_LA_END ;\ ldr r5,=ROM0_PA ;\ ldr r6,=MMU_L1_TYPE_Section|MMU_AP_Any|MMU_Cacheable ;\ ldr r7,=MMU_SECTION_SIZE ;\10: orr r0,r5,r6 ;\ str r0,[r1],#4 ;\ add r5,r5,r7 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 10b ;\/* ROM1 */ ;\ ldr r3,=ROM1_LA_START ;\ ldr r4,=ROM1_LA_END ;\ ldr r5,=ROM1_PA ;\ ldr r6,=MMU_L1_TYPE_Section|MMU_AP_Any ;\ ldr r7,=MMU_SECTION_SIZE ;\10: orr r0,r5,r6 ;\ str r0,[r1],#4 ;\ add r5,r5,r7 ;\ add r3,r3,r7 ;\ cmp r3,r4 ;\ bne 10b ;\/* Now initialize the MMU to use this new page table */ ;\ ldr r1,=MMU_BASE ;\ MMU_INITIALIZE ;\ RELOCATE_TEXT_SEGMENT#endif // CYGSEM_HAL_STATIC_MMU_TABLES#else // CYGSEM_HAL_INSTALL_MMU_TABLES#define PLATFORM_SETUP1 #endif/*---------------------------------------------------------------------------*//* end of hal_platform_setup.h */#endif /* CYGONCE_HAL_PLATFORM_SETUP_H */⌨️ 快捷键说明
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