Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/pfn.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/initrd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/cachectl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <asm/dma.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <asm/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) EXPORT_SYMBOL(invalid_pte_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 						__page_aligned_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) EXPORT_SYMBOL(empty_zero_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #ifdef CONFIG_BLK_DEV_INITRD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static void __init setup_initrd(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if (initrd_start >= initrd_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		pr_err("initrd not found or empty");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		goto disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		pr_err("initrd extends beyond end of memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		goto disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	size = initrd_end - initrd_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (memblock_is_region_reserved(__pa(initrd_start), size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		       __pa(initrd_start), size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		goto disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	memblock_reserve(__pa(initrd_start), size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		(void *)(initrd_start), size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	initrd_below_start_ok = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) disable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	initrd_start = initrd_end = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	pr_err(" - disabling initrd\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) void __init mem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	unsigned long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	max_mapnr = highend_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	max_mapnr = max_low_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) #ifdef CONFIG_BLK_DEV_INITRD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	setup_initrd();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	memblock_free_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		struct page *page = pfn_to_page(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		/* FIXME not sure about */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		if (!memblock_is_reserved(tmp << PAGE_SHIFT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			free_highmem_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	mem_init_print_info(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) extern char __init_begin[], __init_end[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) void free_initmem(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	addr = (unsigned long) &__init_begin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	while (addr < (unsigned long) &__init_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		ClearPageReserved(virt_to_page(addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		init_page_count(virt_to_page(addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		free_page(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		totalram_pages_inc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		addr += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	pr_info("Freeing unused kernel memory: %dk freed\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) void pgd_init(unsigned long *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	for (i = 0; i < PTRS_PER_PGD; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		p[i] = __pa(invalid_pte_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) void __init pre_mmu_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	 * Setup page-table and enable TLB-hardrefill
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	flush_tlb_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	pgd_init((unsigned long *)swapper_pg_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	/* Setup page mask to 4k */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	write_mmu_pagemask(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) void __init fixrange_init(unsigned long start, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			pgd_t *pgd_base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	pgd_t *pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	int i, j, k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	vaddr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	i = pgd_index(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	j = pud_index(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	k = pmd_index(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	pgd = pgd_base + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		pud = (pud_t *)pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			pmd = (pmd_t *)pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				if (pmd_none(*pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 					pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 					if (!pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 						panic("%s: Failed to allocate %lu bytes align=%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 						      __func__, PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 						      PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 					set_pmd(pmd, __pmd(__pa(pte)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 					BUG_ON(pte != pte_offset_kernel(pmd, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 				vaddr += PMD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 			k = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		j = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) void __init fixaddr_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }