Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 219 insertions, 0 deletions

diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
new file mode 100644
index 0000000000..bde7cabd23
--- /dev/null
+++ b/arch/csky/mm/init.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/bug.h>
+#include <linux/module.h>
+#include <linux/init.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/pagemap.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/memblock.h>
+#include <linux/swap.h>
+#include <linux/proc_fs.h>
+#include <linux/pfn.h>
+#include <linux/initrd.h>
+
+#include <asm/setup.h>
+#include <asm/cachectl.h>
+#include <asm/dma.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+#include <asm/cacheflush.h>
+
+#define PTRS_KERN_TABLE \
+		((PTRS_PER_PGD - USER_PTRS_PER_PGD) * PTRS_PER_PTE)
+
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
+pte_t kernel_pte_tables[PTRS_KERN_TABLE] __page_aligned_bss;
+
+EXPORT_SYMBOL(invalid_pte_table);
+unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
+						__page_aligned_bss;
+EXPORT_SYMBOL(empty_zero_page);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+static void __init setup_initrd(void)
+{
+	unsigned long size;
+
+	if (initrd_start >= initrd_end) {
+		pr_err("initrd not found or empty");
+		goto disable;
+	}
+
+	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
+		pr_err("initrd extends beyond end of memory");
+		goto disable;
+	}
+
+	size = initrd_end - initrd_start;
+
+	if (memblock_is_region_reserved(__pa(initrd_start), size)) {
+		pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
+		       __pa(initrd_start), size);
+		goto disable;
+	}
+
+	memblock_reserve(__pa(initrd_start), size);
+
+	pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
+		(void *)(initrd_start), size);
+
+	initrd_below_start_ok = 1;
+
+	return;
+
+disable:
+	initrd_start = initrd_end = 0;
+
+	pr_err(" - disabling initrd\n");
+}
+#endif
+
+void __init mem_init(void)
+{
+#ifdef CONFIG_HIGHMEM
+	unsigned long tmp;
+
+	set_max_mapnr(highend_pfn - ARCH_PFN_OFFSET);
+#else
+	set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
+#endif
+	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	setup_initrd();
+#endif
+
+	memblock_free_all();
+
+#ifdef CONFIG_HIGHMEM
+	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
+		struct page *page = pfn_to_page(tmp);
+
+		/* FIXME not sure about */
+		if (!memblock_is_reserved(tmp << PAGE_SHIFT))
+			free_highmem_page(page);
+	}
+#endif
+}
+
+void free_initmem(void)
+{
+	free_initmem_default(-1);
+}
+
+void pgd_init(unsigned long *p)
+{
+	int i;
+
+	for (i = 0; i < PTRS_PER_PGD; i++)
+		p[i] = __pa(invalid_pte_table);
+
+	flush_tlb_all();
+	local_icache_inv_all(NULL);
+}
+
+void __init mmu_init(unsigned long min_pfn, unsigned long max_pfn)
+{
+	int i;
+
+	for (i = 0; i < USER_PTRS_PER_PGD; i++)
+		swapper_pg_dir[i].pgd = __pa(invalid_pte_table);
+
+	for (i = USER_PTRS_PER_PGD; i < PTRS_PER_PGD; i++)
+		swapper_pg_dir[i].pgd =
+			__pa(kernel_pte_tables + (PTRS_PER_PTE * (i - USER_PTRS_PER_PGD)));
+
+	for (i = 0; i < PTRS_KERN_TABLE; i++)
+		set_pte(&kernel_pte_tables[i], __pte(_PAGE_GLOBAL));
+
+	for (i = min_pfn; i < max_pfn; i++)
+		set_pte(&kernel_pte_tables[i - PFN_DOWN(va_pa_offset)], pfn_pte(i, PAGE_KERNEL));
+
+	flush_tlb_all();
+	local_icache_inv_all(NULL);
+
+	/* Setup page mask to 4k */
+	write_mmu_pagemask(0);
+
+	setup_pgd(swapper_pg_dir, 0);
+}
+
+void __init fixrange_init(unsigned long start, unsigned long end,
+			pgd_t *pgd_base)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+	int i, j, k;
+	unsigned long vaddr;
+
+	vaddr = start;
+	i = pgd_index(vaddr);
+	j = pud_index(vaddr);
+	k = pmd_index(vaddr);
+	pgd = pgd_base + i;
+
+	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
+		pud = (pud_t *)pgd;
+		for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
+			pmd = (pmd_t *)pud;
+			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
+				if (pmd_none(*pmd)) {
+					pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
+					if (!pte)
+						panic("%s: Failed to allocate %lu bytes align=%lx\n",
+						      __func__, PAGE_SIZE,
+						      PAGE_SIZE);
+
+					set_pmd(pmd, __pmd(__pa(pte)));
+					BUG_ON(pte != pte_offset_kernel(pmd, 0));
+				}
+				vaddr += PMD_SIZE;
+			}
+			k = 0;
+		}
+		j = 0;
+	}
+}
+
+void __init fixaddr_init(void)
+{
+	unsigned long vaddr;
+
+	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+	fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
+}
+
+static const pgprot_t protection_map[16] = {
+	[VM_NONE]					= PAGE_NONE,
+	[VM_READ]					= PAGE_READ,
+	[VM_WRITE]					= PAGE_READ,
+	[VM_WRITE | VM_READ]				= PAGE_READ,
+	[VM_EXEC]					= PAGE_READ,
+	[VM_EXEC | VM_READ]				= PAGE_READ,
+	[VM_EXEC | VM_WRITE]				= PAGE_READ,
+	[VM_EXEC | VM_WRITE | VM_READ]			= PAGE_READ,
+	[VM_SHARED]					= PAGE_NONE,
+	[VM_SHARED | VM_READ]				= PAGE_READ,
+	[VM_SHARED | VM_WRITE]				= PAGE_WRITE,
+	[VM_SHARED | VM_WRITE | VM_READ]		= PAGE_WRITE,
+	[VM_SHARED | VM_EXEC]				= PAGE_READ,
+	[VM_SHARED | VM_EXEC | VM_READ]			= PAGE_READ,
+	[VM_SHARED | VM_EXEC | VM_WRITE]		= PAGE_WRITE,
+	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= PAGE_WRITE
+};
+DECLARE_VM_GET_PAGE_PROT