Add realtek target files

Signed-off-by: Roman Yeryomin <roman@advem.lv>

1 files changed, 360 insertions, 0 deletions

diff --git a/target/linux/realtek/files/arch/rlx/mm/init.c b/target/linux/realtek/files/arch/rlx/mm/init.c
new file mode 100644
index 000000000..0d24ff1d6
--- /dev/null
+++ b/target/linux/realtek/files/arch/rlx/mm/init.c
@@ -0,0 +1,360 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994 - 2000 Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
+ */
+#include <linux/bug.h>
+#include <linux/init.h>
+#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/pagemap.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+#include <linux/swap.h>
+#include <linux/proc_fs.h>
+#include <linux/pfn.h>
+
+#include <asm/asm-offsets.h>
+#include <asm/bootinfo.h>
+#include <asm/cachectl.h>
+#include <asm/cpu.h>
+#include <asm/dma.h>
+#include <asm/kmap_types.h>
+#include <asm/mmu_context.h>
+#include <asm/sections.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+#include <asm/fixmap.h>
+
+/* Atomicity and interruptability */
+#define ENTER_CRITICAL(flags) local_irq_save(flags)
+#define EXIT_CRITICAL(flags) local_irq_restore(flags)
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+/*
+ * We have up to 8 empty zeroed pages so we can map one of the right colour
+ * when needed.  This is necessary only on R4000 / R4400 SC and MC versions
+ * where we have to avoid VCED / VECI exceptions for good performance at
+ * any price.  Since page is never written to after the initialization we
+ * don't have to care about aliases on other CPUs.
+ */
+unsigned long empty_zero_page, zero_page_mask;
+EXPORT_SYMBOL_GPL(empty_zero_page);
+
+/*
+ * Not static inline because used by IP27 special magic initialization code
+ */
+unsigned long setup_zero_pages(void)
+{
+	unsigned int order;
+	unsigned long size;
+	struct page *page;
+
+    order = 0;
+
+	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+	if (!empty_zero_page)
+		panic("Oh boy, that early out of memory?");
+
+	page = virt_to_page((void *)empty_zero_page);
+	split_page(page, order);
+	while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
+		SetPageReserved(page);
+		page++;
+	}
+
+	size = PAGE_SIZE << order;
+	zero_page_mask = (size - 1) & PAGE_MASK;
+
+	return 1UL << order;
+}
+
+static inline void kmap_coherent_init(void) {}
+
+void *kmap_coherent(struct page *page, unsigned long addr)
+{
+	enum fixed_addresses idx;
+	unsigned long vaddr, flags, entrylo;
+	unsigned long old_ctx;
+	pte_t pte;
+	int tlbidx;
+
+	BUG_ON(Page_dcache_dirty(page));
+
+	inc_preempt_count();
+	idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
+	vaddr = __fix_to_virt(FIX_CMAP_END - idx);
+	pte = mk_pte(page, PAGE_KERNEL);
+	entrylo = pte_val(pte) >> 6;
+
+	ENTER_CRITICAL(flags);
+	old_ctx = read_c0_entryhi();
+	write_c0_entryhi(vaddr & (PAGE_MASK << 1));
+	write_c0_entrylo0(entrylo);
+	write_c0_entrylo1(entrylo);
+	tlbidx = read_c0_wired();
+	write_c0_wired(tlbidx + 1);
+	write_c0_index(tlbidx);
+	mtc0_tlbw_hazard();
+	tlb_write_indexed();
+	tlbw_use_hazard();
+	write_c0_entryhi(old_ctx);
+	EXIT_CRITICAL(flags);
+
+	return (void*) vaddr;
+}
+
+#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
+
+void kunmap_coherent(void)
+{
+	unsigned int wired;
+	unsigned long flags, old_ctx;
+
+	ENTER_CRITICAL(flags);
+	old_ctx = read_c0_entryhi();
+	wired = read_c0_wired() - 1;
+	write_c0_wired(wired);
+	write_c0_index(wired);
+	write_c0_entryhi(UNIQUE_ENTRYHI(wired));
+	write_c0_entrylo0(0);
+	write_c0_entrylo1(0);
+	mtc0_tlbw_hazard();
+	tlb_write_indexed();
+	tlbw_use_hazard();
+	write_c0_entryhi(old_ctx);
+	EXIT_CRITICAL(flags);
+
+	dec_preempt_count();
+	preempt_check_resched();
+}
+
+void copy_to_user_page(struct vm_area_struct *vma,
+	struct page *page, unsigned long vaddr, void *dst, const void *src,
+	unsigned long len)
+{
+	memcpy(dst, src, len);
+
+	if ((vma->vm_flags & VM_EXEC))
+		flush_cache_page(vma, vaddr, page_to_pfn(page));
+}
+
+void copy_from_user_page(struct vm_area_struct *vma,
+	struct page *page, unsigned long vaddr, void *dst, const void *src,
+	unsigned long len)
+{
+	memcpy(dst, src, len);
+}
+
+void __init fixrange_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
+{
+#if defined(CONFIG_HIGHMEM)
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+	int i, j, k;
+	unsigned long vaddr;
+
+	vaddr = start;
+	i = __pgd_offset(vaddr);
+	j = __pud_offset(vaddr);
+	k = __pmd_offset(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 *) alloc_bootmem_low_pages(PAGE_SIZE);
+					set_pmd(pmd, __pmd((unsigned long)pte));
+					BUG_ON(pte != pte_offset_kernel(pmd, 0));
+				}
+				vaddr += PMD_SIZE;
+			}
+			k = 0;
+		}
+		j = 0;
+	}
+#endif
+}
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+static int __init page_is_ram(unsigned long pagenr)
+{
+	int i;
+
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		unsigned long addr, end;
+
+		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+			/* not usable memory */
+			continue;
+
+		addr = PFN_UP(boot_mem_map.map[i].addr);
+		end = PFN_DOWN(boot_mem_map.map[i].addr +
+			       boot_mem_map.map[i].size);
+
+		if (pagenr >= addr && pagenr < end)
+			return 1;
+	}
+
+	return 0;
+}
+
+void __init paging_init(void)
+{
+	unsigned long max_zone_pfns[MAX_NR_ZONES];
+	unsigned long lastpfn;
+
+	pagetable_init();
+
+#ifdef CONFIG_HIGHMEM
+	kmap_init();
+#endif
+	kmap_coherent_init();
+
+#ifdef CONFIG_ZONE_DMA
+	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
+#endif
+#ifdef CONFIG_ZONE_DMA32
+	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
+#endif
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+	lastpfn = max_low_pfn;
+#ifdef CONFIG_HIGHMEM
+	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
+	lastpfn = highend_pfn;
+#endif
+
+	free_area_init_nodes(max_zone_pfns);
+}
+
+static struct kcore_list kcore_mem, kcore_vmalloc;
+
+void __init mem_init(void)
+{
+	unsigned long codesize, reservedpages, datasize, initsize;
+	unsigned long tmp, ram;
+
+#ifdef CONFIG_HIGHMEM
+	max_mapnr = highend_pfn;
+#else
+	max_mapnr = max_low_pfn;
+#endif
+	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+
+	totalram_pages += free_all_bootmem();
+	totalram_pages -= setup_zero_pages();	/* Setup zeroed pages.  */
+
+	reservedpages = ram = 0;
+	for (tmp = 0; tmp < max_low_pfn; tmp++)
+		if (page_is_ram(tmp)) {
+			ram++;
+			if (PageReserved(pfn_to_page(tmp)))
+				reservedpages++;
+		}
+	num_physpages = ram;
+
+#ifdef CONFIG_HIGHMEM
+	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
+		struct page *page = pfn_to_page(tmp);
+
+		if (!page_is_ram(tmp)) {
+			SetPageReserved(page);
+			continue;
+		}
+		ClearPageReserved(page);
+		init_page_count(page);
+		__free_page(page);
+		totalhigh_pages++;
+	}
+	totalram_pages += totalhigh_pages;
+	num_physpages += totalhigh_pages;
+#endif
+
+	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
+	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
+	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
+		   VMALLOC_END-VMALLOC_START);
+
+	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
+	       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
+	       (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+	       ram << (PAGE_SHIFT-10),
+	       codesize >> 10,
+	       reservedpages << (PAGE_SHIFT-10),
+	       datasize >> 10,
+	       initsize >> 10,
+	       (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
+}
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */
+
+void free_init_pages(const char *what, unsigned long begin, unsigned long end)
+{
+	unsigned long pfn;
+
+	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
+		struct page *page = pfn_to_page(pfn);
+		void *addr = phys_to_virt(PFN_PHYS(pfn));
+
+		ClearPageReserved(page);
+		init_page_count(page);
+		memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
+		__free_page(page);
+		totalram_pages++;
+	}
+	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	free_init_pages("initrd memory",
+			virt_to_phys((void *)start),
+			virt_to_phys((void *)end));
+}
+#endif
+
+void __init_refok free_initmem(void)
+{
+	bsp_free_prom_memory();
+	free_init_pages("unused kernel memory",
+			__pa_symbol(&__init_begin),
+			__pa_symbol(&__init_end));
+}
+
+unsigned long pgd_current[NR_CPUS];
+/*
+ * On 64-bit we've got three-level pagetables with a slightly
+ * different layout ...
+ */
+#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
+
+/*
+ * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
+ * are constants.  So we use the variants from asm-offset.h until that gcc
+ * will officially be retired.
+ */
+pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);