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Linux/arch/mips/dec/prom/memory.c

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  1 /*
  2  * memory.c: memory initialisation code.
  3  *
  4  * Copyright (C) 1998 Harald Koerfgen, Frieder Streffer and Paul M. Antoine
  5  * Copyright (C) 2000, 2002  Maciej W. Rozycki
  6  */
  7 #include <linux/init.h>
  8 #include <linux/kernel.h>
  9 #include <linux/mm.h>
 10 #include <linux/bootmem.h>
 11 #include <linux/types.h>
 12 
 13 #include <asm/addrspace.h>
 14 #include <asm/bootinfo.h>
 15 #include <asm/dec/machtype.h>
 16 #include <asm/dec/prom.h>
 17 #include <asm/page.h>
 18 #include <asm/sections.h>
 19 
 20 
 21 volatile unsigned long mem_err;         /* So we know an error occurred */
 22 
 23 /*
 24  * Probe memory in 4MB chunks, waiting for an error to tell us we've fallen
 25  * off the end of real memory.  Only suitable for the 2100/3100's (PMAX).
 26  */
 27 
 28 #define CHUNK_SIZE 0x400000
 29 
 30 static inline void pmax_setup_memory_region(void)
 31 {
 32         volatile unsigned char *memory_page, dummy;
 33         char old_handler[0x80];
 34         extern char genexcept_early;
 35 
 36         /* Install exception handler */
 37         memcpy(&old_handler, (void *)(CKSEG0 + 0x80), 0x80);
 38         memcpy((void *)(CKSEG0 + 0x80), &genexcept_early, 0x80);
 39 
 40         /* read unmapped and uncached (KSEG1)
 41          * DECstations have at least 4MB RAM
 42          * Assume less than 480MB of RAM, as this is max for 5000/2xx
 43          * FIXME this should be replaced by the first free page!
 44          */
 45         for (memory_page = (unsigned char *)CKSEG1 + CHUNK_SIZE;
 46              mem_err == 0 && memory_page < (unsigned char *)CKSEG1 + 0x1e00000;
 47              memory_page += CHUNK_SIZE) {
 48                 dummy = *memory_page;
 49         }
 50         memcpy((void *)(CKSEG0 + 0x80), &old_handler, 0x80);
 51 
 52         add_memory_region(0, (unsigned long)memory_page - CKSEG1 - CHUNK_SIZE,
 53                           BOOT_MEM_RAM);
 54 }
 55 
 56 /*
 57  * Use the REX prom calls to get hold of the memory bitmap, and thence
 58  * determine memory size.
 59  */
 60 static inline void rex_setup_memory_region(void)
 61 {
 62         int i, bitmap_size;
 63         unsigned long mem_start = 0, mem_size = 0;
 64         memmap *bm;
 65 
 66         /* some free 64k */
 67         bm = (memmap *)CKSEG0ADDR(0x28000);
 68 
 69         bitmap_size = rex_getbitmap(bm);
 70 
 71         for (i = 0; i < bitmap_size; i++) {
 72                 /* FIXME: very simplistically only add full sets of pages */
 73                 if (bm->bitmap[i] == 0xff)
 74                         mem_size += (8 * bm->pagesize);
 75                 else if (!mem_size)
 76                         mem_start += (8 * bm->pagesize);
 77                 else {
 78                         add_memory_region(mem_start, mem_size, BOOT_MEM_RAM);
 79                         mem_start += mem_size + (8 * bm->pagesize);
 80                         mem_size = 0;
 81                 }
 82         }
 83         if (mem_size)
 84                 add_memory_region(mem_start, mem_size, BOOT_MEM_RAM);
 85 }
 86 
 87 void __init prom_meminit(u32 magic)
 88 {
 89         if (!prom_is_rex(magic))
 90                 pmax_setup_memory_region();
 91         else
 92                 rex_setup_memory_region();
 93 }
 94 
 95 void __init prom_free_prom_memory(void)
 96 {
 97         unsigned long end;
 98 
 99         /*
100          * Free everything below the kernel itself but leave
101          * the first page reserved for the exception handlers.
102          */
103 
104 #if IS_ENABLED(CONFIG_DECLANCE)
105         /*
106          * Leave 128 KB reserved for Lance memory for
107          * IOASIC DECstations.
108          *
109          * XXX: save this address for use in dec_lance.c?
110          */
111         if (IOASIC)
112                 end = __pa(&_text) - 0x00020000;
113         else
114 #endif
115                 end = __pa(&_text);
116 
117         free_init_pages("unused PROM memory", PAGE_SIZE, end);
118 }
119 

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