v4.19.13 snapshot.
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
new file mode 100644
index 0000000..92634d4
--- /dev/null
+++ b/arch/sparc/mm/init_32.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/sparc/mm/init.c
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
+ * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
+ */
+
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/initrd.h>
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <linux/bootmem.h>
+#include <linux/memblock.h>
+#include <linux/pagemap.h>
+#include <linux/poison.h>
+#include <linux/gfp.h>
+
+#include <asm/sections.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/vaddrs.h>
+#include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
+#include <asm/setup.h>
+#include <asm/tlb.h>
+#include <asm/prom.h>
+#include <asm/leon.h>
+
+#include "mm_32.h"
+
+unsigned long *sparc_valid_addr_bitmap;
+EXPORT_SYMBOL(sparc_valid_addr_bitmap);
+
+unsigned long phys_base;
+EXPORT_SYMBOL(phys_base);
+
+unsigned long pfn_base;
+EXPORT_SYMBOL(pfn_base);
+
+struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
+
+/* Initial ramdisk setup */
+extern unsigned int sparc_ramdisk_image;
+extern unsigned int sparc_ramdisk_size;
+
+unsigned long highstart_pfn, highend_pfn;
+
+unsigned long last_valid_pfn;
+
+unsigned long calc_highpages(void)
+{
+ int i;
+ int nr = 0;
+
+ for (i = 0; sp_banks[i].num_bytes != 0; i++) {
+ unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
+ unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
+
+ if (end_pfn <= max_low_pfn)
+ continue;
+
+ if (start_pfn < max_low_pfn)
+ start_pfn = max_low_pfn;
+
+ nr += end_pfn - start_pfn;
+ }
+
+ return nr;
+}
+
+static unsigned long calc_max_low_pfn(void)
+{
+ int i;
+ unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
+ unsigned long curr_pfn, last_pfn;
+
+ last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
+ for (i = 1; sp_banks[i].num_bytes != 0; i++) {
+ curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
+
+ if (curr_pfn >= tmp) {
+ if (last_pfn < tmp)
+ tmp = last_pfn;
+ break;
+ }
+
+ last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
+ }
+
+ return tmp;
+}
+
+static void __init find_ramdisk(unsigned long end_of_phys_memory)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+ unsigned long size;
+
+ /* Now have to check initial ramdisk, so that it won't pass
+ * the end of memory
+ */
+ if (sparc_ramdisk_image) {
+ if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
+ sparc_ramdisk_image -= KERNBASE;
+ initrd_start = sparc_ramdisk_image + phys_base;
+ initrd_end = initrd_start + sparc_ramdisk_size;
+ if (initrd_end > end_of_phys_memory) {
+ printk(KERN_CRIT "initrd extends beyond end of memory "
+ "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
+ initrd_end, end_of_phys_memory);
+ initrd_start = 0;
+ } else {
+ /* Reserve the initrd image area. */
+ size = initrd_end - initrd_start;
+ memblock_reserve(initrd_start, size);
+
+ initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
+ initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
+ }
+ }
+#endif
+}
+
+unsigned long __init bootmem_init(unsigned long *pages_avail)
+{
+ unsigned long start_pfn, bytes_avail, size;
+ unsigned long end_of_phys_memory = 0;
+ unsigned long high_pages = 0;
+ int i;
+
+ memblock_set_bottom_up(true);
+ memblock_allow_resize();
+
+ bytes_avail = 0UL;
+ for (i = 0; sp_banks[i].num_bytes != 0; i++) {
+ end_of_phys_memory = sp_banks[i].base_addr +
+ sp_banks[i].num_bytes;
+ bytes_avail += sp_banks[i].num_bytes;
+ if (cmdline_memory_size) {
+ if (bytes_avail > cmdline_memory_size) {
+ unsigned long slack = bytes_avail - cmdline_memory_size;
+
+ bytes_avail -= slack;
+ end_of_phys_memory -= slack;
+
+ sp_banks[i].num_bytes -= slack;
+ if (sp_banks[i].num_bytes == 0) {
+ sp_banks[i].base_addr = 0xdeadbeef;
+ } else {
+ memblock_add(sp_banks[i].base_addr,
+ sp_banks[i].num_bytes);
+ sp_banks[i+1].num_bytes = 0;
+ sp_banks[i+1].base_addr = 0xdeadbeef;
+ }
+ break;
+ }
+ }
+ memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes);
+ }
+
+ /* Start with page aligned address of last symbol in kernel
+ * image.
+ */
+ start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
+
+ /* Now shift down to get the real physical page frame number. */
+ start_pfn >>= PAGE_SHIFT;
+
+ max_pfn = end_of_phys_memory >> PAGE_SHIFT;
+
+ max_low_pfn = max_pfn;
+ highstart_pfn = highend_pfn = max_pfn;
+
+ if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
+ highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
+ max_low_pfn = calc_max_low_pfn();
+ high_pages = calc_highpages();
+ printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+ high_pages >> (20 - PAGE_SHIFT));
+ }
+
+ find_ramdisk(end_of_phys_memory);
+
+ /* Reserve the kernel text/data/bss. */
+ size = (start_pfn << PAGE_SHIFT) - phys_base;
+ memblock_reserve(phys_base, size);
+
+ size = memblock_phys_mem_size() - memblock_reserved_size();
+ *pages_avail = (size >> PAGE_SHIFT) - high_pages;
+
+ return max_pfn;
+}
+
+/*
+ * paging_init() sets up the page tables: We call the MMU specific
+ * init routine based upon the Sun model type on the Sparc.
+ *
+ */
+void __init paging_init(void)
+{
+ srmmu_paging_init();
+ prom_build_devicetree();
+ of_fill_in_cpu_data();
+ device_scan();
+}
+
+static void __init taint_real_pages(void)
+{
+ int i;
+
+ for (i = 0; sp_banks[i].num_bytes; i++) {
+ unsigned long start, end;
+
+ start = sp_banks[i].base_addr;
+ end = start + sp_banks[i].num_bytes;
+
+ while (start < end) {
+ set_bit(start >> 20, sparc_valid_addr_bitmap);
+ start += PAGE_SIZE;
+ }
+ }
+}
+
+static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
+{
+ unsigned long tmp;
+
+#ifdef CONFIG_DEBUG_HIGHMEM
+ printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
+#endif
+
+ for (tmp = start_pfn; tmp < end_pfn; tmp++)
+ free_highmem_page(pfn_to_page(tmp));
+}
+
+void __init mem_init(void)
+{
+ int i;
+
+ if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
+ prom_printf("BUG: fixmap and pkmap areas overlap\n");
+ prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
+ PKMAP_BASE,
+ (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
+ FIXADDR_START);
+ prom_printf("Please mail sparclinux@vger.kernel.org.\n");
+ prom_halt();
+ }
+
+
+ /* Saves us work later. */
+ memset((void *)empty_zero_page, 0, PAGE_SIZE);
+
+ i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
+ i += 1;
+ sparc_valid_addr_bitmap = (unsigned long *)
+ __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
+
+ if (sparc_valid_addr_bitmap == NULL) {
+ prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
+ prom_halt();
+ }
+ memset(sparc_valid_addr_bitmap, 0, i << 2);
+
+ taint_real_pages();
+
+ max_mapnr = last_valid_pfn - pfn_base;
+ high_memory = __va(max_low_pfn << PAGE_SHIFT);
+ free_all_bootmem();
+
+ for (i = 0; sp_banks[i].num_bytes != 0; i++) {
+ unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
+ unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
+
+ if (end_pfn <= highstart_pfn)
+ continue;
+
+ if (start_pfn < highstart_pfn)
+ start_pfn = highstart_pfn;
+
+ map_high_region(start_pfn, end_pfn);
+ }
+
+ mem_init_print_info(NULL);
+}
+
+void free_initmem (void)
+{
+ free_initmem_default(POISON_FREE_INITMEM);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+ "initrd");
+}
+#endif
+
+void sparc_flush_page_to_ram(struct page *page)
+{
+ unsigned long vaddr = (unsigned long)page_address(page);
+
+ if (vaddr)
+ __flush_page_to_ram(vaddr);
+}
+EXPORT_SYMBOL(sparc_flush_page_to_ram);