^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/arch/sparc/mm/init.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/initrd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/poison.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/vaddrs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <asm/leon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include "mm_32.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) unsigned long *sparc_valid_addr_bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) EXPORT_SYMBOL(sparc_valid_addr_bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) unsigned long phys_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) EXPORT_SYMBOL(phys_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) unsigned long pfn_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) EXPORT_SYMBOL(pfn_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* Initial ramdisk setup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) extern unsigned int sparc_ramdisk_image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) extern unsigned int sparc_ramdisk_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) unsigned long highstart_pfn, highend_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) unsigned long last_valid_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) unsigned long calc_highpages(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int nr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) for (i = 0; sp_banks[i].num_bytes != 0; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (end_pfn <= max_low_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (start_pfn < max_low_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) start_pfn = max_low_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) nr += end_pfn - start_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static unsigned long calc_max_low_pfn(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) unsigned long curr_pfn, last_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) for (i = 1; sp_banks[i].num_bytes != 0; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (curr_pfn >= tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (last_pfn < tmp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) tmp = last_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static void __init find_ramdisk(unsigned long end_of_phys_memory)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #ifdef CONFIG_BLK_DEV_INITRD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* Now have to check initial ramdisk, so that it won't pass
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * the end of memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (sparc_ramdisk_image) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) sparc_ramdisk_image -= KERNBASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) initrd_start = sparc_ramdisk_image + phys_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) initrd_end = initrd_start + sparc_ramdisk_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (initrd_end > end_of_phys_memory) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) printk(KERN_CRIT "initrd extends beyond end of memory "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) initrd_end, end_of_phys_memory);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) initrd_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* Reserve the initrd image area. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) size = initrd_end - initrd_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) memblock_reserve(initrd_start, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) unsigned long __init bootmem_init(unsigned long *pages_avail)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) unsigned long start_pfn, bytes_avail, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) unsigned long end_of_phys_memory = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) unsigned long high_pages = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) memblock_set_bottom_up(true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) memblock_allow_resize();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) bytes_avail = 0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) for (i = 0; sp_banks[i].num_bytes != 0; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) end_of_phys_memory = sp_banks[i].base_addr +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) sp_banks[i].num_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) bytes_avail += sp_banks[i].num_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (cmdline_memory_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (bytes_avail > cmdline_memory_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) unsigned long slack = bytes_avail - cmdline_memory_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) bytes_avail -= slack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) end_of_phys_memory -= slack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) sp_banks[i].num_bytes -= slack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (sp_banks[i].num_bytes == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) sp_banks[i].base_addr = 0xdeadbeef;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) memblock_add(sp_banks[i].base_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) sp_banks[i].num_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) sp_banks[i+1].num_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) sp_banks[i+1].base_addr = 0xdeadbeef;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /* Start with page aligned address of last symbol in kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * image.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* Now shift down to get the real physical page frame number. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) start_pfn >>= PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) max_pfn = end_of_phys_memory >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) max_low_pfn = max_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) highstart_pfn = highend_pfn = max_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) max_low_pfn = calc_max_low_pfn();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) high_pages = calc_highpages();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) high_pages >> (20 - PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) find_ramdisk(end_of_phys_memory);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* Reserve the kernel text/data/bss. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) size = (start_pfn << PAGE_SHIFT) - phys_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) memblock_reserve(phys_base, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) memblock_add(phys_base, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) size = memblock_phys_mem_size() - memblock_reserved_size();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) *pages_avail = (size >> PAGE_SHIFT) - high_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /* Only allow low memory to be allocated via memblock allocation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) memblock_set_current_limit(max_low_pfn << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return max_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * paging_init() sets up the page tables: We call the MMU specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * init routine based upon the Sun model type on the Sparc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) void __init paging_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) srmmu_paging_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) prom_build_devicetree();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) of_fill_in_cpu_data();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) device_scan();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) static void __init taint_real_pages(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) for (i = 0; sp_banks[i].num_bytes; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) unsigned long start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) start = sp_banks[i].base_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) end = start + sp_banks[i].num_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) while (start < end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) set_bit(start >> 20, sparc_valid_addr_bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) start += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) unsigned long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) #ifdef CONFIG_DEBUG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) for (tmp = start_pfn; tmp < end_pfn; tmp++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) free_highmem_page(pfn_to_page(tmp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) void __init mem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) prom_printf("BUG: fixmap and pkmap areas overlap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) PKMAP_BASE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) FIXADDR_START);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) prom_printf("Please mail sparclinux@vger.kernel.org.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) prom_halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) /* Saves us work later. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) memset((void *)empty_zero_page, 0, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) i += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) sparc_valid_addr_bitmap = (unsigned long *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) memblock_alloc(i << 2, SMP_CACHE_BYTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (sparc_valid_addr_bitmap == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) prom_halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) memset(sparc_valid_addr_bitmap, 0, i << 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) taint_real_pages();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) max_mapnr = last_valid_pfn - pfn_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) high_memory = __va(max_low_pfn << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) memblock_free_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) for (i = 0; sp_banks[i].num_bytes != 0; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (end_pfn <= highstart_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (start_pfn < highstart_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) start_pfn = highstart_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) map_high_region(start_pfn, end_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) mem_init_print_info(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) void sparc_flush_page_to_ram(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) unsigned long vaddr = (unsigned long)page_address(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (vaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) __flush_page_to_ram(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) EXPORT_SYMBOL(sparc_flush_page_to_ram);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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