2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2 of the License, or (at your
5 * option) any later version.
8 #include <linux/fcntl.h>
11 #include <asm/bootinfo.h>
17 void __init prom_init_memory(void)
19 add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
21 add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
22 20), BOOT_MEM_RESERVED);
23 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
27 bit = fls(memsize + highmemsize);
28 if (bit != ffs(memsize + highmemsize))
33 /* set cpu window3 to map CPU to DDR: 2G -> 2G */
34 LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
35 0x80000000ul, (1 << bit));
38 #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
42 add_memory_region(LOONGSON_HIGHMEM_START,
43 highmemsize << 20, BOOT_MEM_RAM);
45 add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
46 LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
48 #endif /* !CONFIG_64BIT */
51 /* override of arch/mips/mm/cache.c: __uncached_access */
52 int __uncached_access(struct file *file, unsigned long addr)
54 if (file->f_flags & O_DSYNC)
57 return addr >= __pa(high_memory) ||
58 ((addr >= LOONGSON_MMIO_MEM_START) &&
59 (addr < LOONGSON_MMIO_MEM_END));
62 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
64 #include <linux/pci.h>
65 #include <linux/sched.h>
66 #include <asm/current.h>
68 static unsigned long uca_start, uca_end;
70 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
71 unsigned long size, pgprot_t vma_prot)
73 unsigned long offset = pfn << PAGE_SHIFT;
74 unsigned long end = offset + size;
76 if (__uncached_access(file, offset)) {
77 if (((uca_start && offset) >= uca_start) &&
79 return __pgprot((pgprot_val(vma_prot) &
81 _CACHE_UNCACHED_ACCELERATED);
83 return pgprot_noncached(vma_prot);
88 static int __init find_vga_mem_init(void)
90 struct pci_dev *dev = 0;
97 for_each_pci_dev(dev) {
98 if ((dev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
99 for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
100 r = &dev->resource[idx];
101 if (!r->start && r->end)
103 if (r->flags & IORESOURCE_IO)
105 if (r->flags & IORESOURCE_MEM) {
106 uca_start = r->start;
117 late_initcall(find_vga_mem_init);
118 #endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */