// SPDX-License-Identifier: GPL-2.0-or-later /* */ #include <linux/fs.h> #include <linux/fcntl.h> #include <linux/memblock.h> #include <linux/mm.h> #include <asm/bootinfo.h> #include <loongson.h> #include <mem.h> #include <pci.h> u32 memsize, highmemsize; void __init prom_init_memory(void) { memblock_add(0x0, (memsize << 20)); #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) memblock_add(LOONGSON_HIGHMEM_START, highmemsize << 20); #endif /* !CONFIG_64BIT */ } /* 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)); }