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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
159 lines
3.5 KiB
C
159 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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 <boot_param.h>
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#include <mem.h>
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#include <pci.h>
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#ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
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u32 memsize, highmemsize;
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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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#else /* CONFIG_LEFI_FIRMWARE_INTERFACE */
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void __init prom_init_memory(void)
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{
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int i;
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u32 node_id;
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u32 mem_type;
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/* parse memory information */
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for (i = 0; i < loongson_memmap->nr_map; i++) {
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node_id = loongson_memmap->map[i].node_id;
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mem_type = loongson_memmap->map[i].mem_type;
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if (node_id == 0) {
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switch (mem_type) {
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case SYSTEM_RAM_LOW:
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add_memory_region(loongson_memmap->map[i].mem_start,
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(u64)loongson_memmap->map[i].mem_size << 20,
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BOOT_MEM_RAM);
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break;
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case SYSTEM_RAM_HIGH:
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add_memory_region(loongson_memmap->map[i].mem_start,
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(u64)loongson_memmap->map[i].mem_size << 20,
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BOOT_MEM_RAM);
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break;
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case SYSTEM_RAM_RESERVED:
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add_memory_region(loongson_memmap->map[i].mem_start,
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(u64)loongson_memmap->map[i].mem_size << 20,
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BOOT_MEM_RESERVED);
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break;
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}
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}
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}
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}
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#endif /* CONFIG_LEFI_FIRMWARE_INTERFACE */
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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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