120 строки
2.7 KiB
C
120 строки
2.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <asm/bootinfo.h>
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#include <loongson.h>
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#include <mem.h>
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#include <pci.h>
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void __init prom_init_memory(void)
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{
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add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
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add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
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20), BOOT_MEM_RESERVED);
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#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
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{
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int bit;
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bit = fls(memsize + highmemsize);
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if (bit != ffs(memsize + highmemsize))
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bit += 20;
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else
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bit = bit + 20 - 1;
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/* set cpu window3 to map CPU to DDR: 2G -> 2G */
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LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
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0x80000000ul, (1 << bit));
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mmiowb();
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}
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#endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
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#ifdef CONFIG_64BIT
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if (highmemsize > 0)
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add_memory_region(LOONGSON_HIGHMEM_START,
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highmemsize << 20, BOOT_MEM_RAM);
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add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
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LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
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#endif /* !CONFIG_64BIT */
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}
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/* override of arch/mips/mm/cache.c: __uncached_access */
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int __uncached_access(struct file *file, unsigned long addr)
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{
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if (file->f_flags & O_DSYNC)
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return 1;
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return addr >= __pa(high_memory) ||
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((addr >= LOONGSON_MMIO_MEM_START) &&
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(addr < LOONGSON_MMIO_MEM_END));
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}
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#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <asm/current.h>
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static unsigned long uca_start, uca_end;
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pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot)
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{
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unsigned long offset = pfn << PAGE_SHIFT;
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unsigned long end = offset + size;
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if (__uncached_access(file, offset)) {
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if (uca_start && (offset >= uca_start) &&
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(end <= uca_end))
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return __pgprot((pgprot_val(vma_prot) &
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~_CACHE_MASK) |
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_CACHE_UNCACHED_ACCELERATED);
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else
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return pgprot_noncached(vma_prot);
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}
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return vma_prot;
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}
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static int __init find_vga_mem_init(void)
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{
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struct pci_dev *dev = 0;
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struct resource *r;
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int idx;
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if (uca_start)
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return 0;
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for_each_pci_dev(dev) {
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if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
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for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
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r = &dev->resource[idx];
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if (!r->start && r->end)
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continue;
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if (r->flags & IORESOURCE_IO)
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continue;
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if (r->flags & IORESOURCE_MEM) {
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uca_start = r->start;
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uca_end = r->end;
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return 0;
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}
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}
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}
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}
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return 0;
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}
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late_initcall(find_vga_mem_init);
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#endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */
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