45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
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/*
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* palloc.c: Memory allocation from the Sun PROM.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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/* You should not call these routines after memory management
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* has been initialized in the kernel, if fact you should not
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* use these if at all possible in the kernel. They are mainly
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* to be used for a bootloader for temporary allocations which
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* it will free before jumping into the kernel it has loaded.
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*
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* Also, these routines don't work on V0 proms, only V2 and later.
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*/
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/* Allocate a chunk of memory of size 'num_bytes' giving a suggestion
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* of virtual_hint as the preferred virtual base address of this chunk.
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* There are no guarantees that you will get the allocation, or that
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* the prom will abide by your "hint". So check your return value.
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*/
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char *
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prom_alloc(char *virtual_hint, unsigned int num_bytes)
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{
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if(prom_vers == PROM_V0) return (char *) 0x0;
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if(num_bytes == 0x0) return (char *) 0x0;
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return (*(romvec->pv_v2devops.v2_dumb_mem_alloc))(virtual_hint, num_bytes);
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}
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/* Free a previously allocated chunk back to the prom at virtual address
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* 'vaddr' of size 'num_bytes'. NOTE: This vaddr is not the hint you
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* used for the allocation, but the virtual address the prom actually
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* returned to you. They may be have been the same, they may have not,
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* doesn't matter.
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*/
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void
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prom_free(char *vaddr, unsigned int num_bytes)
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{
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if((prom_vers == PROM_V0) || (num_bytes == 0x0)) return;
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(*(romvec->pv_v2devops.v2_dumb_mem_free))(vaddr, num_bytes);
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return;
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}
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