diff options
Diffstat (limited to 'arch/sparc64/prom/memory.c')
| -rw-r--r-- | arch/sparc64/prom/memory.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/sparc64/prom/memory.c b/arch/sparc64/prom/memory.c new file mode 100644 index 000000000000..f4a8143e052c --- /dev/null +++ b/arch/sparc64/prom/memory.c @@ -0,0 +1,152 @@ +/* $Id: memory.c,v 1.5 1999/08/31 06:55:04 davem Exp $ + * memory.c: Prom routine for acquiring various bits of information + * about RAM on the machine, both virtual and physical. + * + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#include <linux/kernel.h> +#include <linux/init.h> + +#include <asm/openprom.h> +#include <asm/oplib.h> + +/* This routine, for consistency, returns the ram parameters in the + * V0 prom memory descriptor format. I choose this format because I + * think it was the easiest to work with. I feel the religious + * arguments now... ;) Also, I return the linked lists sorted to + * prevent paging_init() upset stomach as I have not yet written + * the pepto-bismol kernel module yet. + */ + +struct linux_prom64_registers prom_reg_memlist[64]; +struct linux_prom64_registers prom_reg_tmp[64]; + +struct linux_mlist_p1275 prom_phys_total[64]; +struct linux_mlist_p1275 prom_prom_taken[64]; +struct linux_mlist_p1275 prom_phys_avail[64]; + +struct linux_mlist_p1275 *prom_ptot_ptr = prom_phys_total; +struct linux_mlist_p1275 *prom_ptak_ptr = prom_prom_taken; +struct linux_mlist_p1275 *prom_pavl_ptr = prom_phys_avail; + +struct linux_mem_p1275 prom_memlist; + + +/* Internal Prom library routine to sort a linux_mlist_p1275 memory + * list. Used below in initialization. + */ +static void __init +prom_sortmemlist(struct linux_mlist_p1275 *thislist) +{ + int swapi = 0; + int i, mitr; + unsigned long tmpaddr, tmpsize; + unsigned long lowest; + + for(i=0; thislist[i].theres_more; i++) { + lowest = thislist[i].start_adr; + for(mitr = i+1; thislist[mitr-1].theres_more; mitr++) + if(thislist[mitr].start_adr < lowest) { + lowest = thislist[mitr].start_adr; + swapi = mitr; + } + if(lowest == thislist[i].start_adr) continue; + tmpaddr = thislist[swapi].start_adr; + tmpsize = thislist[swapi].num_bytes; + for(mitr = swapi; mitr > i; mitr--) { + thislist[mitr].start_adr = thislist[mitr-1].start_adr; + thislist[mitr].num_bytes = thislist[mitr-1].num_bytes; + } + thislist[i].start_adr = tmpaddr; + thislist[i].num_bytes = tmpsize; + } +} + +/* Initialize the memory lists based upon the prom version. */ +void __init prom_meminit(void) +{ + int node = 0; + unsigned int iter, num_regs; + + node = prom_finddevice("/memory"); + num_regs = prom_getproperty(node, "available", + (char *) prom_reg_memlist, + sizeof(prom_reg_memlist)); + num_regs = (num_regs/sizeof(struct linux_prom64_registers)); + for(iter=0; iter<num_regs; iter++) { + prom_phys_avail[iter].start_adr = + prom_reg_memlist[iter].phys_addr; + prom_phys_avail[iter].num_bytes = + prom_reg_memlist[iter].reg_size; + prom_phys_avail[iter].theres_more = + &prom_phys_avail[iter+1]; + } + prom_phys_avail[iter-1].theres_more = NULL; + + num_regs = prom_getproperty(node, "reg", + (char *) prom_reg_memlist, + sizeof(prom_reg_memlist)); + num_regs = (num_regs/sizeof(struct linux_prom64_registers)); + for(iter=0; iter<num_regs; iter++) { + prom_phys_total[iter].start_adr = + prom_reg_memlist[iter].phys_addr; + prom_phys_total[iter].num_bytes = + prom_reg_memlist[iter].reg_size; + prom_phys_total[iter].theres_more = + &prom_phys_total[iter+1]; + } + prom_phys_total[iter-1].theres_more = NULL; + + node = prom_finddevice("/virtual-memory"); + num_regs = prom_getproperty(node, "available", + (char *) prom_reg_memlist, + sizeof(prom_reg_memlist)); + num_regs = (num_regs/sizeof(struct linux_prom64_registers)); + + /* Convert available virtual areas to taken virtual + * areas. First sort, then convert. + */ + for(iter=0; iter<num_regs; iter++) { + prom_prom_taken[iter].start_adr = + prom_reg_memlist[iter].phys_addr; + prom_prom_taken[iter].num_bytes = + prom_reg_memlist[iter].reg_size; + prom_prom_taken[iter].theres_more = + &prom_prom_taken[iter+1]; + } + prom_prom_taken[iter-1].theres_more = NULL; + + prom_sortmemlist(prom_prom_taken); + + /* Finally, convert. */ + for(iter=0; iter<num_regs; iter++) { + prom_prom_taken[iter].start_adr = + prom_prom_taken[iter].start_adr + + prom_prom_taken[iter].num_bytes; + prom_prom_taken[iter].num_bytes = + prom_prom_taken[iter+1].start_adr - + prom_prom_taken[iter].start_adr; + } + prom_prom_taken[iter-1].num_bytes = + -1UL - prom_prom_taken[iter-1].start_adr; + + /* Sort the other two lists. */ + prom_sortmemlist(prom_phys_total); + prom_sortmemlist(prom_phys_avail); + + /* Link all the lists into the top-level descriptor. */ + prom_memlist.p1275_totphys=&prom_ptot_ptr; + prom_memlist.p1275_prommap=&prom_ptak_ptr; + prom_memlist.p1275_available=&prom_pavl_ptr; +} + +/* This returns a pointer to our libraries internal p1275 format + * memory descriptor. + */ +struct linux_mem_p1275 * +prom_meminfo(void) +{ + return &prom_memlist; +} |