1 files changed, 159 insertions, 0 deletions
diff --git a/arch/unicore32/kernel/hibernate.c b/arch/unicore32/kernel/hibernate.c
new file mode 100644
index 00000000..d75ef8b6
--- /dev/null
+++ b/arch/unicore32/kernel/hibernate.c
@@ -0,0 +1,159 @@
+/*
+ *  linux/arch/unicore32/kernel/hibernate.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ *	Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ *	Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/gfp.h>
+#include <linux/suspend.h>
+#include <linux/bootmem.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/suspend.h>
+
+#include "mach/pm.h"
+
+/* Pointer to the temporary resume page tables */
+pgd_t *resume_pg_dir;
+
+struct swsusp_arch_regs swsusp_arch_regs_cpu0;
+
+/*
+ * Create a middle page table on a resume-safe page and put a pointer to it in
+ * the given global directory entry.  This only returns the gd entry
+ * in non-PAE compilation mode, since the middle layer is folded.
+ */
+static pmd_t *resume_one_md_table_init(pgd_t *pgd)
+{
+	pud_t *pud;
+	pmd_t *pmd_table;
+
+	pud = pud_offset(pgd, 0);
+	pmd_table = pmd_offset(pud, 0);
+
+	return pmd_table;
+}
+
+/*
+ * Create a page table on a resume-safe page and place a pointer to it in
+ * a middle page directory entry.
+ */
+static pte_t *resume_one_page_table_init(pmd_t *pmd)
+{
+	if (pmd_none(*pmd)) {
+		pte_t *page_table = (pte_t *)get_safe_page(GFP_ATOMIC);
+		if (!page_table)
+			return NULL;
+
+		set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_KERNEL_TABLE));
+
+		BUG_ON(page_table != pte_offset_kernel(pmd, 0));
+
+		return page_table;
+	}
+
+	return pte_offset_kernel(pmd, 0);
+}
+
+/*
+ * This maps the physical memory to kernel virtual address space, a total
+ * of max_low_pfn pages, by creating page tables starting from address
+ * PAGE_OFFSET.  The page tables are allocated out of resume-safe pages.
+ */
+static int resume_physical_mapping_init(pgd_t *pgd_base)
+{
+	unsigned long pfn;
+	pgd_t *pgd;
+	pmd_t *pmd;
+	pte_t *pte;
+	int pgd_idx, pmd_idx;
+
+	pgd_idx = pgd_index(PAGE_OFFSET);
+	pgd = pgd_base + pgd_idx;
+	pfn = 0;
+
+	for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
+		pmd = resume_one_md_table_init(pgd);
+		if (!pmd)
+			return -ENOMEM;
+
+		if (pfn >= max_low_pfn)
+			continue;
+
+		for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD; pmd++, pmd_idx++) {
+			pte_t *max_pte;
+
+			if (pfn >= max_low_pfn)
+				break;
+
+			/* Map with normal page tables.
+			 * NOTE: We can mark everything as executable here
+			 */
+			pte = resume_one_page_table_init(pmd);
+			if (!pte)
+				return -ENOMEM;
+
+			max_pte = pte + PTRS_PER_PTE;
+			for (; pte < max_pte; pte++, pfn++) {
+				if (pfn >= max_low_pfn)
+					break;
+
+				set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
+			}
+		}
+	}
+
+	return 0;
+}
+
+static inline void resume_init_first_level_page_table(pgd_t *pg_dir)
+{
+}
+
+int swsusp_arch_resume(void)
+{
+	int error;
+
+	resume_pg_dir = (pgd_t *)get_safe_page(GFP_ATOMIC);
+	if (!resume_pg_dir)
+		return -ENOMEM;
+
+	resume_init_first_level_page_table(resume_pg_dir);
+	error = resume_physical_mapping_init(resume_pg_dir);
+	if (error)
+		return error;
+
+	/* We have got enough memory and from now on we cannot recover */
+	restore_image(resume_pg_dir, restore_pblist);
+	return 0;
+}
+
+/*
+ *	pfn_is_nosave - check if given pfn is in the 'nosave' section
+ */
+
+int pfn_is_nosave(unsigned long pfn)
+{
+	unsigned long begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
+	unsigned long end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
+
+	return (pfn >= begin_pfn) && (pfn < end_pfn);
+}
+
+void save_processor_state(void)
+{
+}
+
+void restore_processor_state(void)
+{
+	local_flush_tlb_all();
+}