From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/sparc/prom/memory.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 arch/sparc/prom/memory.c (limited to 'arch/sparc/prom/memory.c') diff --git a/arch/sparc/prom/memory.c b/arch/sparc/prom/memory.c new file mode 100644 index 000000000..269d6ab5e --- /dev/null +++ b/arch/sparc/prom/memory.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0 +/* memory.c: Prom routine for acquiring various bits of information + * about RAM on the machine, both virtual and physical. + * + * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) + * Copyright (C) 1997 Michael A. Griffith (grif@acm.org) + */ + +#include +#include +#include + +#include +#include +#include + +static int __init prom_meminit_v0(void) +{ + struct linux_mlist_v0 *p; + int index; + + 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++; + } + + return index; +} + +static int __init prom_meminit_v2(void) +{ + struct linux_prom_registers reg[64]; + phandle node; + int 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 num_ents; +} + +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 i, num_ents = 0; + + switch (prom_vers) { + case PROM_V0: + num_ents = prom_meminit_v0(); + break; + + case PROM_V2: + case PROM_V3: + num_ents = prom_meminit_v2(); + break; + + default: + break; + } + sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks), + sp_banks_cmp, NULL); + + /* 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; +} -- cgit v1.2.3