/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * PROM library functions for acquiring/using memory descriptors given to * us from the YAMON. * * Copyright (C) 1999,2000,2012 MIPS Technologies, Inc. * All rights reserved. * Authors: Carsten Langgaard * Steven J. Hill */ #include #include #include #include #include #include static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS]; /* determined physical memory size, not overridden by command line args */ unsigned long physical_memsize = 0L; fw_memblock_t * __init fw_getmdesc(int eva) { char *memsize_str, *ememsize_str __maybe_unused = NULL, *ptr; unsigned long memsize, ememsize __maybe_unused = 0; static char cmdline[COMMAND_LINE_SIZE] __initdata; int tmp; /* otherwise look in the environment */ memsize_str = fw_getenv("memsize"); if (memsize_str) tmp = kstrtol(memsize_str, 0, &memsize); if (eva) { /* Look for ememsize for EVA */ ememsize_str = fw_getenv("ememsize"); if (ememsize_str) tmp = kstrtol(ememsize_str, 0, &ememsize); } if (!memsize && !ememsize) { pr_warn("memsize not set in YAMON, set to default (32Mb)\n"); physical_memsize = 0x02000000; } else { /* If ememsize is set, then set physical_memsize to that */ physical_memsize = ememsize ? : memsize; } #ifdef CONFIG_CPU_BIG_ENDIAN /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last word of physical memory */ physical_memsize -= PAGE_SIZE; #endif /* Check the command line for a memsize directive that overrides the physical/default amount */ strcpy(cmdline, arcs_cmdline); ptr = strstr(cmdline, "memsize="); if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' ')) ptr = strstr(ptr, " memsize="); /* And now look for ememsize */ if (eva) { ptr = strstr(cmdline, "ememsize="); if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' ')) ptr = strstr(ptr, " ememsize="); } if (ptr) memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr); else memsize = physical_memsize; /* Last 64K for HIGHMEM arithmetics */ if (memsize > 0x7fff0000) memsize = 0x7fff0000; memset(mdesc, 0, sizeof(mdesc)); mdesc[0].type = fw_dontuse; mdesc[0].base = PHYS_OFFSET; mdesc[0].size = 0x00001000; mdesc[1].type = fw_code; mdesc[1].base = mdesc[0].base + 0x00001000UL; mdesc[1].size = 0x000ef000; /* * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the * south bridge and PCI access always forwarded to the ISA Bus and * BIOSCS# is always generated. * This mean that this area can't be used as DMA memory for PCI * devices. */ mdesc[2].type = fw_dontuse; mdesc[2].base = mdesc[0].base + 0x000f0000UL; mdesc[2].size = 0x00010000; mdesc[3].type = fw_dontuse; mdesc[3].base = mdesc[0].base + 0x00100000UL; mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) - 0x00100000UL; mdesc[4].type = fw_free; mdesc[4].base = mdesc[0].base + CPHYSADDR(PFN_ALIGN(&_end)); mdesc[4].size = memsize - CPHYSADDR(mdesc[4].base); return &mdesc[0]; } static int __init fw_memtype_classify(unsigned int type) { switch (type) { case fw_free: return BOOT_MEM_RAM; case fw_code: return BOOT_MEM_ROM_DATA; default: return BOOT_MEM_RESERVED; } } void __init fw_meminit(void) { fw_memblock_t *p; p = fw_getmdesc(config_enabled(CONFIG_EVA)); while (p->size) { long type; unsigned long base, size; type = fw_memtype_classify(p->type); base = p->base; size = p->size; add_memory_region(base, size, type); p++; } } void __init prom_free_prom_memory(void) { unsigned long addr; int i; for (i = 0; i < boot_mem_map.nr_map; i++) { if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA) continue; addr = boot_mem_map.map[i].addr; free_init_pages("YAMON memory", addr, addr + boot_mem_map.map[i].size); } }