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author | David S. Miller <davem@davemloft.net> | 2008-05-02 05:28:17 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2008-05-02 12:22:53 (GMT) |
commit | 9f2b2a5f68c27c00f1e1f1922de5aa2f24505ed8 (patch) | |
tree | 2afd44efe02154ab1bfcbd47e1d8ba55167da4e5 /arch/sparc/prom/memory.c | |
parent | ccc34028d46230f715eeda4c8cce27e919934fad (diff) | |
download | linux-9f2b2a5f68c27c00f1e1f1922de5aa2f24505ed8.tar.xz |
sparc32: More memory probing consolidation.
The PROM library function prom_meminit() builds a table,
prom_phys_avail[], just so that probe_memory() in
arch/sparc/mm/fault.c can copy it into sp_banks[].
Just have prom_meminit() fill in the sp_banks[] array directly, and
remove duplicated sort() function.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/prom/memory.c')
-rw-r--r-- | arch/sparc/prom/memory.c | 144 |
1 files changed, 62 insertions, 82 deletions
diff --git a/arch/sparc/prom/memory.c b/arch/sparc/prom/memory.c index 08ac1bf..947f047 100644 --- a/arch/sparc/prom/memory.c +++ b/arch/sparc/prom/memory.c @@ -1,120 +1,100 @@ /* 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) 1995, 2008 David S. Miller (davem@davemloft.net) * Copyright (C) 1997 Michael A. Griffith (grif@acm.org) */ #include <linux/kernel.h> +#include <linux/sort.h> #include <linux/init.h> #include <asm/openprom.h> #include <asm/sun4prom.h> #include <asm/oplib.h> +#include <asm/page.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. - */ +static int __init prom_meminit_v0(void) +{ + struct linux_mlist_v0 *p; + int index; -struct linux_prom_registers prom_reg_memlist[64]; + index = 0; + for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) { + sp_banks[index].base_addr = (unsigned long) p->start_adr; + sp_banks[index].num_bytes = p->num_bytes; + index++; + } -struct linux_mlist_v0 prom_phys_avail[64]; + return index; +} -/* Internal Prom library routine to sort a linux_mlist_v0 memory - * list. Used below in initialization. - */ -static void __init -prom_sortmemlist(struct linux_mlist_v0 *thislist) +static int __init prom_meminit_v2(void) { - int swapi = 0; - int i, mitr, tmpsize; - char *tmpaddr; - char *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; + struct linux_prom_registers reg[64]; + int node, size, num_ents, i; + + node = prom_searchsiblings(prom_getchild(prom_root_node), "memory"); + size = prom_getproperty(node, "available", (char *) reg, sizeof(reg)); + num_ents = size / sizeof(struct linux_prom_registers); + + for (i = 0; i < num_ents; i++) { + sp_banks[i].base_addr = reg[i].phys_addr; + sp_banks[i].num_bytes = reg[i].reg_size; } - return; + return num_ents; +} + +static int __init prom_meminit_sun4(void) +{ +#ifdef CONFIG_SUN4 + sp_banks[0].base_addr = 0; + sp_banks[0].num_bytes = *(sun4_romvec->memoryavail); +#endif + return 1; +} + +static int sp_banks_cmp(const void *a, const void *b) +{ + const struct sparc_phys_banks *x = a, *y = b; + + if (x->base_addr > y->base_addr) + return 1; + if (x->base_addr < y->base_addr) + return -1; + return 0; } /* Initialize the memory lists based upon the prom version. */ void __init prom_meminit(void) { - int node = 0; - unsigned int iter, num_regs; - struct linux_mlist_v0 *mptr; /* ptr for traversal */ + int i, num_ents = 0; - switch(prom_vers) { + switch (prom_vers) { case PROM_V0: - /* Nice, kind of easier to do in this case. */ - for(mptr = (*(romvec->pv_v0mem.v0_available)), iter=0; - mptr; mptr=mptr->theres_more, iter++) { - prom_phys_avail[iter].start_adr = mptr->start_adr; - prom_phys_avail[iter].num_bytes = mptr->num_bytes; - prom_phys_avail[iter].theres_more = &prom_phys_avail[iter+1]; - } - prom_phys_avail[iter-1].theres_more = NULL; - prom_sortmemlist(prom_phys_avail); + num_ents = prom_meminit_v0(); break; + case PROM_V2: case PROM_V3: - /* Grrr, have to traverse the prom device tree ;( */ - node = prom_getchild(prom_root_node); - node = prom_searchsiblings(node, "memory"); - num_regs = prom_getproperty(node, "available", - (char *) prom_reg_memlist, - sizeof(prom_reg_memlist)); - num_regs = (num_regs/sizeof(struct linux_prom_registers)); - for(iter=0; iter<num_regs; iter++) { - prom_phys_avail[iter].start_adr = - (char *) prom_reg_memlist[iter].phys_addr; - prom_phys_avail[iter].num_bytes = - (unsigned long) 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; - prom_sortmemlist(prom_phys_avail); + num_ents = prom_meminit_v2(); break; case PROM_SUN4: -#ifdef CONFIG_SUN4 - /* how simple :) */ - prom_phys_avail[0].start_adr = NULL; - prom_phys_avail[0].num_bytes = *(sun4_romvec->memoryavail); - prom_phys_avail[0].theres_more = NULL; -#endif + num_ents = prom_meminit_sun4(); break; default: break; - }; -} + } + sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks), + sp_banks_cmp, NULL); -/* This returns a pointer to our libraries internal v0 format - * available memory list. - */ -struct linux_mlist_v0 * -prom_meminfo(void) -{ - return prom_phys_avail; + /* Sentinel. */ + sp_banks[num_ents].base_addr = 0xdeadbeef; + sp_banks[num_ents].num_bytes = 0; + + for (i = 0; i < num_ents; i++) + sp_banks[i].num_bytes &= PAGE_MASK; } |