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Diffstat (limited to '')
| -rw-r--r-- | arch/mips/fw/arc/memory.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/arch/mips/fw/arc/memory.c b/arch/mips/fw/arc/memory.c new file mode 100644 index 000000000..dd9496f26 --- /dev/null +++ b/arch/mips/fw/arc/memory.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * memory.c: PROM library functions for acquiring/using memory descriptors + * given to us from the ARCS firmware. + * + * Copyright (C) 1996 by David S. Miller + * Copyright (C) 1999, 2000, 2001 by Ralf Baechle + * Copyright (C) 1999, 2000 by Silicon Graphics, Inc. + * + * PROM library functions for acquiring/using memory descriptors given to us + * from the ARCS firmware. This is only used when CONFIG_ARC_MEMORY is set + * because on some machines like SGI IP27 the ARC memory configuration data + * completely bogus and alternate easier to use mechanisms are available. + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/bootmem.h> +#include <linux/swap.h> + +#include <asm/sgialib.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/bootinfo.h> + +#undef DEBUG + +/* + * For ARC firmware memory functions the unit of meassuring memory is always + * a 4k page of memory + */ +#define ARC_PAGE_SHIFT 12 + +struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current) +{ + return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current); +} + +#ifdef DEBUG /* convenient for debugging */ +static char *arcs_mtypes[8] = { + "Exception Block", + "ARCS Romvec Page", + "Free/Contig RAM", + "Generic Free RAM", + "Bad Memory", + "Standalone Program Pages", + "ARCS Temp Storage Area", + "ARCS Permanent Storage Area" +}; + +static char *arc_mtypes[8] = { + "Exception Block", + "SystemParameterBlock", + "FreeMemory", + "Bad Memory", + "LoadedProgram", + "FirmwareTemporary", + "FirmwarePermanent", + "FreeContiguous" +}; +#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \ + : arc_mtypes[a.arc] +#endif + +static inline int memtype_classify_arcs(union linux_memtypes type) +{ + switch (type.arcs) { + case arcs_fcontig: + case arcs_free: + return BOOT_MEM_RAM; + case arcs_atmp: + return BOOT_MEM_ROM_DATA; + case arcs_eblock: + case arcs_rvpage: + case arcs_bmem: + case arcs_prog: + case arcs_aperm: + return BOOT_MEM_RESERVED; + default: + BUG(); + } + while(1); /* Nuke warning. */ +} + +static inline int memtype_classify_arc(union linux_memtypes type) +{ + switch (type.arc) { + case arc_free: + case arc_fcontig: + return BOOT_MEM_RAM; + case arc_atmp: + return BOOT_MEM_ROM_DATA; + case arc_eblock: + case arc_rvpage: + case arc_bmem: + case arc_prog: + case arc_aperm: + return BOOT_MEM_RESERVED; + default: + BUG(); + } + while(1); /* Nuke warning. */ +} + +static int __init prom_memtype_classify(union linux_memtypes type) +{ + if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */ + return memtype_classify_arcs(type); + + return memtype_classify_arc(type); +} + +void __init prom_meminit(void) +{ + struct linux_mdesc *p; + +#ifdef DEBUG + int i = 0; + + printk("ARCS MEMORY DESCRIPTOR dump:\n"); + p = ArcGetMemoryDescriptor(PROM_NULL_MDESC); + while(p) { + printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n", + i, p, p->base, p->pages, mtypes(p->type)); + p = ArcGetMemoryDescriptor(p); + i++; + } +#endif + + p = PROM_NULL_MDESC; + while ((p = ArcGetMemoryDescriptor(p))) { + unsigned long base, size; + long type; + + base = p->base << ARC_PAGE_SHIFT; + size = p->pages << ARC_PAGE_SHIFT; + type = prom_memtype_classify(p->type); + + add_memory_region(base, size, type); + } +} + +void __init prom_free_prom_memory(void) +{ + unsigned long addr; + int i; + + if (prom_flags & PROM_FLAG_DONT_FREE_TEMP) + return; + + 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("prom memory", + addr, addr + boot_mem_map.map[i].size); + } +} |