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