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common/memsize.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * (C) Copyright 2004 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
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*/ |
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#include <common.h> DECLARE_GLOBAL_DATA_PTR; |
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#ifdef __PPC__ /* * At least on G2 PowerPC cores, sequential accesses to non-existent * memory must be synchronized. */ # include <asm/io.h> /* for sync() */ #else # define sync() /* nothing */ #endif |
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/* * Check memory range for valid RAM. A simple memory test determines * the actually available RAM size between addresses `base' and * `base + maxsize'. */ |
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long get_ram_size(long *base, long maxsize) |
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{ volatile long *addr; |
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long save[BITS_PER_LONG - 1]; |
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long save_base; |
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long cnt; long val; long size; int i = 0; |
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for (cnt = (maxsize / sizeof(long)) >> 1; cnt > 0; cnt >>= 1) { |
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addr = base + cnt; /* pointer arith! */ |
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sync(); |
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save[i++] = *addr; |
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sync(); |
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*addr = ~cnt; |
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} |
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addr = base; sync(); |
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save_base = *addr; |
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sync(); *addr = 0; |
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sync(); |
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if ((val = *addr) != 0) { /* Restore the original data before leaving the function. */ sync(); |
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*base = save_base; |
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for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) { addr = base + cnt; sync(); *addr = save[--i]; } return (0); } for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) { |
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addr = base + cnt; /* pointer arith! */ val = *addr; |
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*addr = save[--i]; if (val != ~cnt) { |
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size = cnt * sizeof(long); /* * Restore the original data * before leaving the function. |
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*/ |
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for (cnt <<= 1; cnt < maxsize / sizeof(long); cnt <<= 1) { |
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addr = base + cnt; |
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*addr = save[--i]; |
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} |
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/* warning: don't restore save_base in this case, * it is already done in the loop because * base and base+size share the same physical memory * and *base is saved after *(base+size) modification * in first loop */ |
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return (size); } |
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} |
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*base = save_base; |
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return (maxsize); } |
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phys_size_t __weak get_effective_memsize(void) { #ifndef CONFIG_VERY_BIG_RAM return gd->ram_size; #else /* limit stack to what we can reasonable map */ return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ? CONFIG_MAX_MEM_MAPPED : gd->ram_size); #endif } |