Changeset dd0c8a0 in mainline for boot/arch/arm32/src
- Timestamp:
- 2013-09-29T06:56:33Z (12 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- a9bd960d
- Parents:
- 3deb0155 (diff), 13be2583 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the(diff)
links above to see all the changes relative to each parent. - Location:
- boot/arch/arm32/src
- Files:
-
- 3 edited
Legend:
- Unmodified
- Added
- Removed
-
boot/arch/arm32/src/asm.S
r3deb0155 rdd0c8a0 56 56 jump_to_kernel: 57 57 # 58 # TODO59 58 # Make sure that the I-cache, D-cache and memory are mutually coherent 60 59 # before passing control to the copied code. … … 68 67 #define CP15_C1_BP 11 69 68 #define CP15_C1_DC 2 70 # Disable I-cache and D-cache before the kernel is started. 69 70 71 #ifndef PROCESSOR_ARCH_armv7_a 71 72 mrc p15, 0, r4, c1, c0, 0 73 74 # D-cache before the kernel is started. 72 75 bic r4, r4, #(1 << CP15_C1_DC) 76 77 # Disable I-cache and Branche predictors. 73 78 bic r4, r4, #(1 << CP15_C1_IC) 74 79 bic r4, r4, #(1 << CP15_C1_BP) 80 75 81 mcr p15, 0, r4, c1, c0, 0 82 #endif 83 76 84 77 85 … … 81 89 #else 82 90 #cp15 dsb, r4 is ignored (should be zero) 91 mov r4, #0 83 92 mcr p15, 0, r4, c7, c10, 4 84 93 #endif 85 94 86 95 # Clean ICache and BPredictors, r4 ignored (SBZ) 96 mov r4, #0 87 97 mcr p15, 0, r4, c7, c5, 0 88 98 nop -
boot/arch/arm32/src/main.c
r3deb0155 rdd0c8a0 53 53 extern void *bdata_end; 54 54 55 56 static inline void invalidate_icache(void)57 {58 /* ICIALLU Invalidate entire ICache */59 asm volatile ("mov r0, #0\n" "mcr p15, 0, r0, c7, c5, 0\n" ::: "r0" );60 }61 62 static inline void invalidate_dcache(void *address, size_t size)63 {64 const uintptr_t addr = (uintptr_t)address;65 /* DCIMVAC - invalidate by address to the point of coherence */66 for (uintptr_t a = addr; a < addr + size; a += 4) {67 asm volatile ("mcr p15, 0, %[a], c7, c6, 1\n" :: [a]"r"(a) : );68 }69 }70 71 55 static inline void clean_dcache_poc(void *address, size_t size) 72 56 { 73 57 const uintptr_t addr = (uintptr_t)address; 74 /* DCCMVAC - clean by address to the point of coherence */75 58 for (uintptr_t a = addr; a < addr + size; a += 4) { 59 /* DCCMVAC - clean by address to the point of coherence */ 76 60 asm volatile ("mcr p15, 0, %[a], c7, c10, 1\n" :: [a]"r"(a) : ); 77 61 } … … 82 66 void bootstrap(void) 83 67 { 84 /* Make sure we run in memory code when caches are enabled,85 * make sure we read memory data too. This part is ARMv7 specific as86 * ARMv7 no longer invalidates caches on restart.87 * See chapter B2.2.2 of ARM Architecture Reference Manual p. B2-1263*/88 invalidate_icache();89 invalidate_dcache(&bdata_start, &bdata_end - &bdata_start);90 91 68 /* Enable MMU and caches */ 92 69 mmu_start(); … … 105 82 components[i].start, components[i].name, components[i].inflated, 106 83 components[i].size); 107 invalidate_dcache(components[i].start, components[i].size);108 84 } 109 85 … … 148 124 halt(); 149 125 } 126 /* Make sure data are in the memory, ICache will need them */ 150 127 clean_dcache_poc(dest[i - 1], components[i - 1].inflated); 151 128 } -
boot/arch/arm32/src/mm.c
r3deb0155 rdd0c8a0 37 37 #include <arch/asm.h> 38 38 #include <arch/mm.h> 39 #include <arch/cp15.h> 40 41 #ifdef PROCESSOR_ARCH_armv7_a 42 static unsigned log2(unsigned val) 43 { 44 unsigned log = 0; 45 while (val >> log++); 46 return log - 2; 47 } 48 49 static void dcache_invalidate_level(unsigned level) 50 { 51 CSSELR_write(level << 1); 52 const uint32_t ccsidr = CCSIDR_read(); 53 const unsigned sets = CCSIDR_SETS(ccsidr); 54 const unsigned ways = CCSIDR_WAYS(ccsidr); 55 const unsigned line_log = CCSIDR_LINESIZE_LOG(ccsidr); 56 const unsigned set_shift = line_log; 57 const unsigned way_shift = 32 - log2(ways); 58 59 for (unsigned k = 0; k < ways; ++k) 60 for (unsigned j = 0; j < sets; ++j) { 61 const uint32_t val = (level << 1) | 62 (j << set_shift) | (k << way_shift); 63 DCISW_write(val); 64 } 65 } 66 67 /** invalidate all dcaches -- armv7 */ 68 static void cache_invalidate(void) 69 { 70 const uint32_t cinfo = CLIDR_read(); 71 for (unsigned i = 0; i < 7; ++i) { 72 switch (CLIDR_CACHE(i, cinfo)) 73 { 74 case CLIDR_DCACHE_ONLY: 75 case CLIDR_SEP_CACHE: 76 case CLIDR_UNI_CACHE: 77 dcache_invalidate_level(i); 78 } 79 } 80 asm volatile ( "dsb\n" ); 81 ICIALLU_write(0); 82 asm volatile ( "isb\n" ); 83 } 84 #endif 39 85 40 86 /** Disable the MMU */ … … 60 106 static inline int section_cacheable(pfn_t section) 61 107 { 108 const unsigned long address = section << PTE_SECTION_SHIFT; 62 109 #ifdef MACHINE_gta02 63 unsigned long address = section << PTE_SECTION_SHIFT; 64 65 if (address >= GTA02_IOMEM_START && address < GTA02_IOMEM_END) 66 return 0; 67 else 110 if (address < GTA02_IOMEM_START || address >= GTA02_IOMEM_END) 68 111 return 1; 69 112 #elif defined MACHINE_beagleboardxm 70 const unsigned long address = section << PTE_SECTION_SHIFT;71 113 if (address >= BBXM_RAM_START && address < BBXM_RAM_END) 72 114 return 1; 73 115 #elif defined MACHINE_beaglebone 74 const unsigned long address = section << PTE_SECTION_SHIFT;75 116 if (address >= AM335x_RAM_START && address < AM335x_RAM_END) 76 117 return 1; 77 118 #elif defined MACHINE_raspberrypi 78 const unsigned long address = section << PTE_SECTION_SHIFT;79 119 if (address < BCM2835_RAM_END) 80 120 return 1; 81 121 #endif 82 return 0;122 return address * 0; 83 123 } 84 124 … … 99 139 { 100 140 pte->descriptor_type = PTE_DESCRIPTOR_SECTION; 101 pte->bufferable = 1;102 pte->cacheable = section_cacheable(frame);103 141 pte->xn = 0; 104 142 pte->domain = 0; 105 143 pte->should_be_zero_1 = 0; 106 144 pte->access_permission_0 = PTE_AP_USER_NO_KERNEL_RW; 145 #ifdef PROCESSOR_ARCH_armv7_a 146 /* 147 * Keeps this setting in sync with memory type attributes in: 148 * init_boot_pt (boot/arch/arm32/src/mm.c) 149 * set_pt_level1_flags (kernel/arch/arm32/include/arch/mm/page_armv6.h) 150 * set_ptl0_addr (kernel/arch/arm32/include/arch/mm/page.h) 151 */ 152 pte->tex = section_cacheable(frame) ? 5 : 0; 153 pte->cacheable = section_cacheable(frame) ? 0 : 0; 154 pte->bufferable = section_cacheable(frame) ? 1 : 0; 155 #else 156 pte->bufferable = 1; 157 pte->cacheable = section_cacheable(frame); 107 158 pte->tex = 0; 159 #endif 108 160 pte->access_permission_1 = 0; 109 161 pte->shareable = 0; … … 117 169 static void init_boot_pt(void) 118 170 { 119 #if defined MACHINE_raspberrypi 120 const pfn_t split_page = 2048; 121 #else 122 const pfn_t split_page = PTL0_ENTRIES; 123 #endif 124 125 /* Create 1:1 virtual-physical mapping (in lower 2 GB). */ 126 pfn_t page; 127 for (page = 0; page < split_page; page++) 171 /* 172 * Create 1:1 virtual-physical mapping. 173 * Physical memory on BBxM a BBone starts at 2GB 174 * boundary, icp has a memory mirror at 2GB. 175 * (ARM Integrator Core Module User guide ch. 6.3, p. 6-7) 176 * gta02 somehow works (probably due to limited address size), 177 * s3c2442b manual ch. 5, p.5-1: 178 * "Address space: 128Mbytes per bank (total 1GB/8 banks)" 179 */ 180 for (pfn_t page = 0; page < PTL0_ENTRIES; ++page) 128 181 init_ptl0_section(&boot_pt[page], page); 129 182 130 #if defined MACHINE_raspberrypi 131 for (; page < PTL0_ENTRIES; page++) 132 init_ptl0_section(&boot_pt[page], page - split_page); 133 #endif 134 asm volatile ( 135 "mcr p15, 0, %[pt], c2, c0, 0\n" 136 :: [pt] "r" (boot_pt) 137 ); 183 /* 184 * Tell MMU page might be cached. Keeps this setting in sync 185 * with memory type attributes in: 186 * init_ptl0_section (boot/arch/arm32/src/mm.c) 187 * set_pt_level1_flags (kernel/arch/arm32/include/arch/mm/page_armv6.h) 188 * set_ptl0_addr (kernel/arch/arm32/include/arch/mm/page.h) 189 */ 190 uint32_t val = (uint32_t)boot_pt & TTBR_ADDR_MASK; 191 val |= TTBR_RGN_WBWA_CACHE | TTBR_C_FLAG; 192 TTBR0_write(val); 138 193 } 139 194 … … 154 209 * we disable caches before jumping to kernel 155 210 * so this is safe for all archs. 211 * Enable VMSAv6 the bit (23) is only writable on ARMv6. 212 * (and QEMU) 156 213 */ 214 #ifdef PROCESSOR_ARCH_armv6 215 "ldr r1, =0x00801805\n" 216 #else 157 217 "ldr r1, =0x00001805\n" 218 #endif 158 219 159 220 "orr r0, r0, r1\n" … … 173 234 void mmu_start() { 174 235 disable_paging(); 236 #ifdef PROCESSOR_ARCH_armv7_a 237 /* Make sure we run in memory code when caches are enabled, 238 * make sure we read memory data too. This part is ARMv7 specific as 239 * ARMv7 no longer invalidates caches on restart. 240 * See chapter B2.2.2 of ARM Architecture Reference Manual p. B2-1263*/ 241 cache_invalidate(); 242 #endif 175 243 init_boot_pt(); 176 244 enable_paging();
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