2 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
3 * Chen Liqin <liqin.chen@sunplusct.com>
4 * Lennox Wu <lennox.wu@sunplusct.com>
5 * Copyright (C) 2012 Regents of the University of California
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see the file COPYING, or write
19 * to the Free Software Foundation, Inc.,
22 #include <linux/init.h>
24 #include <linux/memblock.h>
25 #include <linux/sched.h>
26 #include <linux/initrd.h>
27 #include <linux/console.h>
28 #include <linux/screen_info.h>
29 #include <linux/of_fdt.h>
30 #include <linux/of_platform.h>
31 #include <linux/sched/task.h>
32 #include <linux/swiotlb.h>
34 #include <asm/setup.h>
35 #include <asm/sections.h>
36 #include <asm/pgtable.h>
39 #include <asm/tlbflush.h>
40 #include <asm/thread_info.h>
42 #ifdef CONFIG_DUMMY_CONSOLE
43 struct screen_info screen_info
= {
44 .orig_video_lines
= 30,
45 .orig_video_cols
= 80,
47 .orig_video_ega_bx
= 0,
48 .orig_video_isVGA
= 1,
49 .orig_video_points
= 8
53 unsigned long va_pa_offset
;
54 EXPORT_SYMBOL(va_pa_offset
);
55 unsigned long pfn_base
;
56 EXPORT_SYMBOL(pfn_base
);
58 unsigned long empty_zero_page
[PAGE_SIZE
/ sizeof(unsigned long)] __page_aligned_bss
;
59 EXPORT_SYMBOL(empty_zero_page
);
61 /* The lucky hart to first increment this variable will boot the other cores */
62 atomic_t hart_lottery
;
64 #ifdef CONFIG_BLK_DEV_INITRD
65 static void __init
setup_initrd(void)
67 extern char __initramfs_start
[];
68 extern unsigned long __initramfs_size
;
71 if (__initramfs_size
> 0) {
72 initrd_start
= (unsigned long)(&__initramfs_start
);
73 initrd_end
= initrd_start
+ __initramfs_size
;
76 if (initrd_start
>= initrd_end
) {
77 printk(KERN_INFO
"initrd not found or empty");
80 if (__pa(initrd_end
) > PFN_PHYS(max_low_pfn
)) {
81 printk(KERN_ERR
"initrd extends beyond end of memory");
85 size
= initrd_end
- initrd_start
;
86 memblock_reserve(__pa(initrd_start
), size
);
87 initrd_below_start_ok
= 1;
89 printk(KERN_INFO
"Initial ramdisk at: 0x%p (%lu bytes)\n",
90 (void *)(initrd_start
), size
);
93 pr_cont(" - disabling initrd\n");
97 #endif /* CONFIG_BLK_DEV_INITRD */
99 pgd_t swapper_pg_dir
[PTRS_PER_PGD
] __page_aligned_bss
;
100 pgd_t trampoline_pg_dir
[PTRS_PER_PGD
] __initdata
__aligned(PAGE_SIZE
);
102 #ifndef __PAGETABLE_PMD_FOLDED
103 #define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT)
104 pmd_t swapper_pmd
[PTRS_PER_PMD
*((-PAGE_OFFSET
)/PGDIR_SIZE
)] __page_aligned_bss
;
105 pmd_t trampoline_pmd
[PTRS_PER_PGD
] __initdata
__aligned(PAGE_SIZE
);
108 asmlinkage
void __init
setup_vm(void)
112 uintptr_t pa
= (uintptr_t) &_start
;
113 pgprot_t prot
= __pgprot(pgprot_val(PAGE_KERNEL
) | _PAGE_EXEC
);
115 va_pa_offset
= PAGE_OFFSET
- pa
;
116 pfn_base
= PFN_DOWN(pa
);
118 /* Sanity check alignment and size */
119 BUG_ON((PAGE_OFFSET
% PGDIR_SIZE
) != 0);
120 BUG_ON((pa
% (PAGE_SIZE
* PTRS_PER_PTE
)) != 0);
122 #ifndef __PAGETABLE_PMD_FOLDED
123 trampoline_pg_dir
[(PAGE_OFFSET
>> PGDIR_SHIFT
) % PTRS_PER_PGD
] =
124 pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd
),
125 __pgprot(_PAGE_TABLE
));
126 trampoline_pmd
[0] = pfn_pmd(PFN_DOWN(pa
), prot
);
128 for (i
= 0; i
< (-PAGE_OFFSET
)/PGDIR_SIZE
; ++i
) {
129 size_t o
= (PAGE_OFFSET
>> PGDIR_SHIFT
) % PTRS_PER_PGD
+ i
;
131 pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd
) + i
,
132 __pgprot(_PAGE_TABLE
));
134 for (i
= 0; i
< ARRAY_SIZE(swapper_pmd
); i
++)
135 swapper_pmd
[i
] = pfn_pmd(PFN_DOWN(pa
+ i
* PMD_SIZE
), prot
);
137 trampoline_pg_dir
[(PAGE_OFFSET
>> PGDIR_SHIFT
) % PTRS_PER_PGD
] =
138 pfn_pgd(PFN_DOWN(pa
), prot
);
140 for (i
= 0; i
< (-PAGE_OFFSET
)/PGDIR_SIZE
; ++i
) {
141 size_t o
= (PAGE_OFFSET
>> PGDIR_SHIFT
) % PTRS_PER_PGD
+ i
;
143 pfn_pgd(PFN_DOWN(pa
+ i
* PGDIR_SIZE
), prot
);
148 void __init
parse_dtb(unsigned int hartid
, void *dtb
)
150 early_init_dt_scan(__va(dtb
));
153 static void __init
setup_bootmem(void)
155 struct memblock_region
*reg
;
156 phys_addr_t mem_size
= 0;
158 /* Find the memory region containing the kernel */
159 for_each_memblock(memory
, reg
) {
160 phys_addr_t vmlinux_end
= __pa(_end
);
161 phys_addr_t end
= reg
->base
+ reg
->size
;
163 if (reg
->base
<= vmlinux_end
&& vmlinux_end
<= end
) {
165 * Reserve from the start of the region to the end of
168 memblock_reserve(reg
->base
, vmlinux_end
- reg
->base
);
169 mem_size
= min(reg
->size
, (phys_addr_t
)-PAGE_OFFSET
);
172 BUG_ON(mem_size
== 0);
174 set_max_mapnr(PFN_DOWN(mem_size
));
175 max_low_pfn
= pfn_base
+ PFN_DOWN(mem_size
);
177 #ifdef CONFIG_BLK_DEV_INITRD
179 #endif /* CONFIG_BLK_DEV_INITRD */
181 early_init_fdt_reserve_self();
182 early_init_fdt_scan_reserved_mem();
183 memblock_allow_resize();
186 for_each_memblock(memory
, reg
) {
187 unsigned long start_pfn
= memblock_region_memory_base_pfn(reg
);
188 unsigned long end_pfn
= memblock_region_memory_end_pfn(reg
);
190 memblock_set_node(PFN_PHYS(start_pfn
),
191 PFN_PHYS(end_pfn
- start_pfn
),
192 &memblock
.memory
, 0);
196 void __init
setup_arch(char **cmdline_p
)
198 *cmdline_p
= boot_command_line
;
202 init_mm
.start_code
= (unsigned long) _stext
;
203 init_mm
.end_code
= (unsigned long) _etext
;
204 init_mm
.end_data
= (unsigned long) _edata
;
205 init_mm
.brk
= (unsigned long) _end
;
209 unflatten_device_tree();
216 #ifdef CONFIG_DUMMY_CONSOLE
217 conswitchp
= &dummy_con
;