| /* |
| * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. |
| * Chen Liqin <liqin.chen@sunplusct.com> |
| * Lennox Wu <lennox.wu@sunplusct.com> |
| * Copyright (C) 2012 Regents of the University of California |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see the file COPYING, or write |
| * to the Free Software Foundation, Inc., |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/mm.h> |
| #include <linux/memblock.h> |
| #include <linux/sched.h> |
| #include <linux/initrd.h> |
| #include <linux/console.h> |
| #include <linux/screen_info.h> |
| #include <linux/of_fdt.h> |
| #include <linux/of_platform.h> |
| #include <linux/sched/task.h> |
| #include <linux/swiotlb.h> |
| |
| #include <asm/setup.h> |
| #include <asm/sections.h> |
| #include <asm/pgtable.h> |
| #include <asm/smp.h> |
| #include <asm/sbi.h> |
| #include <asm/tlbflush.h> |
| #include <asm/thread_info.h> |
| |
| #ifdef CONFIG_DUMMY_CONSOLE |
| struct screen_info screen_info = { |
| .orig_video_lines = 30, |
| .orig_video_cols = 80, |
| .orig_video_mode = 0, |
| .orig_video_ega_bx = 0, |
| .orig_video_isVGA = 1, |
| .orig_video_points = 8 |
| }; |
| #endif |
| |
| unsigned long va_pa_offset; |
| EXPORT_SYMBOL(va_pa_offset); |
| unsigned long pfn_base; |
| EXPORT_SYMBOL(pfn_base); |
| |
| unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
| EXPORT_SYMBOL(empty_zero_page); |
| |
| /* The lucky hart to first increment this variable will boot the other cores */ |
| atomic_t hart_lottery; |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| static void __init setup_initrd(void) |
| { |
| extern char __initramfs_start[]; |
| extern unsigned long __initramfs_size; |
| unsigned long size; |
| |
| if (__initramfs_size > 0) { |
| initrd_start = (unsigned long)(&__initramfs_start); |
| initrd_end = initrd_start + __initramfs_size; |
| } |
| |
| if (initrd_start >= initrd_end) { |
| printk(KERN_INFO "initrd not found or empty"); |
| goto disable; |
| } |
| if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { |
| printk(KERN_ERR "initrd extends beyond end of memory"); |
| goto disable; |
| } |
| |
| size = initrd_end - initrd_start; |
| memblock_reserve(__pa(initrd_start), size); |
| initrd_below_start_ok = 1; |
| |
| printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n", |
| (void *)(initrd_start), size); |
| return; |
| disable: |
| pr_cont(" - disabling initrd\n"); |
| initrd_start = 0; |
| initrd_end = 0; |
| } |
| #endif /* CONFIG_BLK_DEV_INITRD */ |
| |
| pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; |
| pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); |
| |
| #ifndef __PAGETABLE_PMD_FOLDED |
| #define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT) |
| pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss; |
| pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); |
| #endif |
| |
| asmlinkage void __init setup_vm(void) |
| { |
| extern char _start; |
| uintptr_t i; |
| uintptr_t pa = (uintptr_t) &_start; |
| pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC); |
| |
| va_pa_offset = PAGE_OFFSET - pa; |
| pfn_base = PFN_DOWN(pa); |
| |
| /* Sanity check alignment and size */ |
| BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); |
| BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0); |
| |
| #ifndef __PAGETABLE_PMD_FOLDED |
| trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] = |
| pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd), |
| __pgprot(_PAGE_TABLE)); |
| trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot); |
| |
| for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) { |
| size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i; |
| swapper_pg_dir[o] = |
| pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i, |
| __pgprot(_PAGE_TABLE)); |
| } |
| for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++) |
| swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot); |
| #else |
| trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] = |
| pfn_pgd(PFN_DOWN(pa), prot); |
| |
| for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) { |
| size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i; |
| swapper_pg_dir[o] = |
| pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot); |
| } |
| #endif |
| } |
| |
| void __init parse_dtb(unsigned int hartid, void *dtb) |
| { |
| early_init_dt_scan(__va(dtb)); |
| } |
| |
| static void __init setup_bootmem(void) |
| { |
| struct memblock_region *reg; |
| phys_addr_t mem_size = 0; |
| |
| /* Find the memory region containing the kernel */ |
| for_each_memblock(memory, reg) { |
| phys_addr_t vmlinux_end = __pa(_end); |
| phys_addr_t end = reg->base + reg->size; |
| |
| if (reg->base <= vmlinux_end && vmlinux_end <= end) { |
| /* |
| * Reserve from the start of the region to the end of |
| * the kernel |
| */ |
| memblock_reserve(reg->base, vmlinux_end - reg->base); |
| mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET); |
| } |
| } |
| BUG_ON(mem_size == 0); |
| |
| set_max_mapnr(PFN_DOWN(mem_size)); |
| max_low_pfn = pfn_base + PFN_DOWN(mem_size); |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| setup_initrd(); |
| #endif /* CONFIG_BLK_DEV_INITRD */ |
| |
| early_init_fdt_reserve_self(); |
| early_init_fdt_scan_reserved_mem(); |
| memblock_allow_resize(); |
| memblock_dump_all(); |
| |
| for_each_memblock(memory, reg) { |
| unsigned long start_pfn = memblock_region_memory_base_pfn(reg); |
| unsigned long end_pfn = memblock_region_memory_end_pfn(reg); |
| |
| memblock_set_node(PFN_PHYS(start_pfn), |
| PFN_PHYS(end_pfn - start_pfn), |
| &memblock.memory, 0); |
| } |
| } |
| |
| void __init setup_arch(char **cmdline_p) |
| { |
| *cmdline_p = boot_command_line; |
| |
| parse_early_param(); |
| |
| init_mm.start_code = (unsigned long) _stext; |
| init_mm.end_code = (unsigned long) _etext; |
| init_mm.end_data = (unsigned long) _edata; |
| init_mm.brk = (unsigned long) _end; |
| |
| setup_bootmem(); |
| paging_init(); |
| unflatten_device_tree(); |
| swiotlb_init(1); |
| |
| #ifdef CONFIG_SMP |
| setup_smp(); |
| #endif |
| |
| #ifdef CONFIG_DUMMY_CONSOLE |
| conswitchp = &dummy_con; |
| #endif |
| |
| riscv_fill_hwcap(); |
| } |
| |
| static int __init riscv_device_init(void) |
| { |
| return of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); |
| } |
| subsys_initcall_sync(riscv_device_init); |