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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/blackfin/mm/init.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/blackfin/mm/init.c')
-rw-r--r--kernel/arch/blackfin/mm/init.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/kernel/arch/blackfin/mm/init.c b/kernel/arch/blackfin/mm/init.c
new file mode 100644
index 000000000..166842de3
--- /dev/null
+++ b/kernel/arch/blackfin/mm/init.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2004-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/gfp.h>
+#include <linux/swap.h>
+#include <linux/bootmem.h>
+#include <linux/uaccess.h>
+#include <linux/export.h>
+#include <asm/bfin-global.h>
+#include <asm/pda.h>
+#include <asm/cplbinit.h>
+#include <asm/early_printk.h>
+#include "blackfin_sram.h"
+
+/*
+ * ZERO_PAGE is a special page that is used for zero-initialized data and COW.
+ * Let the bss do its zero-init magic so we don't have to do it ourselves.
+ */
+char empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
+EXPORT_SYMBOL(empty_zero_page);
+
+#ifndef CONFIG_EXCEPTION_L1_SCRATCH
+#if defined CONFIG_SYSCALL_TAB_L1
+__attribute__((l1_data))
+#endif
+static unsigned long exception_stack[NR_CPUS][1024];
+#endif
+
+struct blackfin_pda cpu_pda[NR_CPUS];
+EXPORT_SYMBOL(cpu_pda);
+
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses of available kernel virtual memory.
+ */
+void __init paging_init(void)
+{
+ /*
+ * make sure start_mem is page aligned, otherwise bootmem and
+ * page_alloc get different views of the world
+ */
+ unsigned long end_mem = memory_end & PAGE_MASK;
+
+ unsigned long zones_size[MAX_NR_ZONES] = {
+ [0] = 0,
+ [ZONE_DMA] = (end_mem - CONFIG_PHY_RAM_BASE_ADDRESS) >> PAGE_SHIFT,
+ [ZONE_NORMAL] = 0,
+#ifdef CONFIG_HIGHMEM
+ [ZONE_HIGHMEM] = 0,
+#endif
+ };
+
+ /* Set up SFC/DFC registers (user data space) */
+ set_fs(KERNEL_DS);
+
+ pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n",
+ PAGE_ALIGN(memory_start), end_mem);
+ free_area_init_node(0, zones_size,
+ CONFIG_PHY_RAM_BASE_ADDRESS >> PAGE_SHIFT, NULL);
+}
+
+asmlinkage void __init init_pda(void)
+{
+ unsigned int cpu = raw_smp_processor_id();
+
+ early_shadow_stamp();
+
+ /* Initialize the PDA fields holding references to other parts
+ of the memory. The content of such memory is still
+ undefined at the time of the call, we are only setting up
+ valid pointers to it. */
+ memset(&cpu_pda[cpu], 0, sizeof(cpu_pda[cpu]));
+
+#ifdef CONFIG_EXCEPTION_L1_SCRATCH
+ cpu_pda[cpu].ex_stack = (unsigned long *)(L1_SCRATCH_START + \
+ L1_SCRATCH_LENGTH);
+#else
+ cpu_pda[cpu].ex_stack = exception_stack[cpu + 1];
+#endif
+
+#ifdef CONFIG_SMP
+ cpu_pda[cpu].imask = 0x1f;
+#endif
+}
+
+void __init mem_init(void)
+{
+ char buf[64];
+
+ high_memory = (void *)(memory_end & PAGE_MASK);
+ max_mapnr = MAP_NR(high_memory);
+ printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", max_mapnr);
+
+ /* This will put all low memory onto the freelists. */
+ free_all_bootmem();
+
+ snprintf(buf, sizeof(buf) - 1, "%uK DMA", DMA_UNCACHED_REGION >> 10);
+ mem_init_print_info(buf);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void __init free_initrd_mem(unsigned long start, unsigned long end)
+{
+#ifndef CONFIG_MPU
+ free_reserved_area((void *)start, (void *)end, -1, "initrd");
+#endif
+}
+#endif
+
+void __init_refok free_initmem(void)
+{
+#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
+ free_initmem_default(-1);
+ if (memory_start == (unsigned long)(&__init_end))
+ memory_start = (unsigned long)(&__init_begin);
+#endif
+}