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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | /* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/fs.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <asm/bootinfo.h> #include <loongson.h> #include <boot_param.h> #include <mem.h> #include <pci.h> #ifndef CONFIG_LEFI_FIRMWARE_INTERFACE u32 memsize, highmemsize; void __init prom_init_memory(void) { add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM); add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize << 20), BOOT_MEM_RESERVED); #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG { int bit; bit = fls(memsize + highmemsize); if (bit != ffs(memsize + highmemsize)) bit += 20; else bit = bit + 20 - 1; /* set cpu window3 to map CPU to DDR: 2G -> 2G */ LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul, 0x80000000ul, (1 << bit)); mmiowb(); } #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */ #ifdef CONFIG_64BIT if (highmemsize > 0) add_memory_region(LOONGSON_HIGHMEM_START, highmemsize << 20, BOOT_MEM_RAM); add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START - LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED); #endif /* !CONFIG_64BIT */ } #else /* CONFIG_LEFI_FIRMWARE_INTERFACE */ void __init prom_init_memory(void) { int i; u32 node_id; u32 mem_type; /* parse memory information */ for (i = 0; i < loongson_memmap->nr_map; i++) { node_id = loongson_memmap->map[i].node_id; mem_type = loongson_memmap->map[i].mem_type; if (node_id == 0) { switch (mem_type) { case SYSTEM_RAM_LOW: add_memory_region(loongson_memmap->map[i].mem_start, (u64)loongson_memmap->map[i].mem_size << 20, BOOT_MEM_RAM); break; case SYSTEM_RAM_HIGH: add_memory_region(loongson_memmap->map[i].mem_start, (u64)loongson_memmap->map[i].mem_size << 20, BOOT_MEM_RAM); break; case MEM_RESERVED: add_memory_region(loongson_memmap->map[i].mem_start, (u64)loongson_memmap->map[i].mem_size << 20, BOOT_MEM_RESERVED); break; } } } } #endif /* CONFIG_LEFI_FIRMWARE_INTERFACE */ /* override of arch/mips/mm/cache.c: __uncached_access */ int __uncached_access(struct file *file, unsigned long addr) { if (file->f_flags & O_DSYNC) return 1; return addr >= __pa(high_memory) || ((addr >= LOONGSON_MMIO_MEM_START) && (addr < LOONGSON_MMIO_MEM_END)); } #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED #include <linux/pci.h> #include <linux/sched.h> #include <asm/current.h> static unsigned long uca_start, uca_end; pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t vma_prot) { unsigned long offset = pfn << PAGE_SHIFT; unsigned long end = offset + size; if (__uncached_access(file, offset)) { if (uca_start && (offset >= uca_start) && (end <= uca_end)) return __pgprot((pgprot_val(vma_prot) & ~_CACHE_MASK) | _CACHE_UNCACHED_ACCELERATED); else return pgprot_noncached(vma_prot); } return vma_prot; } static int __init find_vga_mem_init(void) { struct pci_dev *dev = 0; struct resource *r; int idx; if (uca_start) return 0; for_each_pci_dev(dev) { if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) { r = &dev->resource[idx]; if (!r->start && r->end) continue; if (r->flags & IORESOURCE_IO) continue; if (r->flags & IORESOURCE_MEM) { uca_start = r->start; uca_end = r->end; return 0; } } } } return 0; } late_initcall(find_vga_mem_init); #endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */ |