1/*
2 * Copyright 2004-2009 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later.
5 */
6
7#include <linux/gfp.h>
8#include <linux/swap.h>
9#include <linux/bootmem.h>
10#include <linux/uaccess.h>
11#include <linux/export.h>
12#include <asm/bfin-global.h>
13#include <asm/pda.h>
14#include <asm/cplbinit.h>
15#include <asm/early_printk.h>
16#include "blackfin_sram.h"
17
18/*
19 * ZERO_PAGE is a special page that is used for zero-initialized data and COW.
20 * Let the bss do its zero-init magic so we don't have to do it ourselves.
21 */
22char empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
23EXPORT_SYMBOL(empty_zero_page);
24
25#ifndef CONFIG_EXCEPTION_L1_SCRATCH
26#if defined CONFIG_SYSCALL_TAB_L1
27__attribute__((l1_data))
28#endif
29static unsigned long exception_stack[NR_CPUS][1024];
30#endif
31
32struct blackfin_pda cpu_pda[NR_CPUS];
33EXPORT_SYMBOL(cpu_pda);
34
35/*
36 * paging_init() continues the virtual memory environment setup which
37 * was begun by the code in arch/head.S.
38 * The parameters are pointers to where to stick the starting and ending
39 * addresses  of available kernel virtual memory.
40 */
41void __init paging_init(void)
42{
43	/*
44	 * make sure start_mem is page aligned, otherwise bootmem and
45	 * page_alloc get different views of the world
46	 */
47	unsigned long end_mem = memory_end & PAGE_MASK;
48
49	unsigned long zones_size[MAX_NR_ZONES] = {
50		[0] = 0,
51		[ZONE_DMA] = (end_mem - CONFIG_PHY_RAM_BASE_ADDRESS) >> PAGE_SHIFT,
52		[ZONE_NORMAL] = 0,
53#ifdef CONFIG_HIGHMEM
54		[ZONE_HIGHMEM] = 0,
55#endif
56	};
57
58	/* Set up SFC/DFC registers (user data space) */
59	set_fs(KERNEL_DS);
60
61	pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n",
62	        PAGE_ALIGN(memory_start), end_mem);
63	free_area_init_node(0, zones_size,
64		CONFIG_PHY_RAM_BASE_ADDRESS >> PAGE_SHIFT, NULL);
65}
66
67asmlinkage void __init init_pda(void)
68{
69	unsigned int cpu = raw_smp_processor_id();
70
71	early_shadow_stamp();
72
73	/* Initialize the PDA fields holding references to other parts
74	   of the memory. The content of such memory is still
75	   undefined at the time of the call, we are only setting up
76	   valid pointers to it. */
77	memset(&cpu_pda[cpu], 0, sizeof(cpu_pda[cpu]));
78
79#ifdef CONFIG_EXCEPTION_L1_SCRATCH
80	cpu_pda[cpu].ex_stack = (unsigned long *)(L1_SCRATCH_START + \
81					L1_SCRATCH_LENGTH);
82#else
83	cpu_pda[cpu].ex_stack = exception_stack[cpu + 1];
84#endif
85
86#ifdef CONFIG_SMP
87	cpu_pda[cpu].imask = 0x1f;
88#endif
89}
90
91void __init mem_init(void)
92{
93	char buf[64];
94
95	high_memory = (void *)(memory_end & PAGE_MASK);
96	max_mapnr = MAP_NR(high_memory);
97	printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", max_mapnr);
98
99	/* This will put all low memory onto the freelists. */
100	free_all_bootmem();
101
102	snprintf(buf, sizeof(buf) - 1, "%uK DMA", DMA_UNCACHED_REGION >> 10);
103	mem_init_print_info(buf);
104}
105
106#ifdef CONFIG_BLK_DEV_INITRD
107void __init free_initrd_mem(unsigned long start, unsigned long end)
108{
109#ifndef CONFIG_MPU
110	free_reserved_area((void *)start, (void *)end, -1, "initrd");
111#endif
112}
113#endif
114
115void __init_refok free_initmem(void)
116{
117#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
118	free_initmem_default(-1);
119	if (memory_start == (unsigned long)(&__init_end))
120		memory_start = (unsigned long)(&__init_begin);
121#endif
122}
123