Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Memory subsystem initialization for Hexagon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <asm/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <asm/vm_mmu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * Define a startpg just past the end of the kernel image and a lastpg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * that corresponds to the end of real or simulated platform memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) unsigned long bootmem_lastpg;	/*  Should be set by platform code  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) unsigned long __phys_offset;	/*  physical kernel offset >> 12  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /*  Set as variable to limit PMD copies  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) int max_kernel_seg = 0x303;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) /*  indicate pfn's of high memory  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) unsigned long highstart_pfn, highend_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /* Default cache attribute for newly created page tables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) unsigned long _dflt_cache_att = CACHEDEF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * The current "generation" of kernel map, which should not roll
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * over until Hell freezes over.  Actual bound in years needs to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * calculated to confirm.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) DEFINE_SPINLOCK(kmap_gen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) /*  checkpatch says don't init this to 0.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) unsigned long long kmap_generation;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * mem_init - initializes memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * Frees up bootmem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * Fixes up more stuff for HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * Calculates and displays memory available/used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) void __init mem_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	/*  No idea where this is actually declared.  Seems to evade LXR.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	memblock_free_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	mem_init_print_info(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	 *  To-Do:  someone somewhere should wipe out the bootmem map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	 *  after we're done?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	 * This can be moved to some more virtual-memory-specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	 * initialization hook at some point.  Set the init_mm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	 * descriptors "context" value to point to the initial
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	 * kernel segment table's physical address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	init_mm.context.ptbase = __pa(init_mm.pgd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) void sync_icache_dcache(pte_t pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	page = pte_page(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	addr = (unsigned long) page_address(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	__vmcache_idsync(addr, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  * In order to set up page allocator "nodes",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  * somebody has to call free_area_init() for UMA.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  * In this mode, we only have one pg_data_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  * structure: contig_mem_data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) void __init paging_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	 *  This is not particularly well documented anywhere, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	 *  give ZONE_NORMAL all the memory, including the big holes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	 *  left by the kernel+bootmem_map which are already left as reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	 *  in the bootmem_map; free_area_init should see those bits and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	 *  adjust accordingly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	free_area_init(max_zone_pfn);  /*  sets up the zonelists and mem_map  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	 * Start of high memory area.  Will probably need something more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	 * fancy if we...  get more fancy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #ifndef DMA_RESERVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #define DMA_RESERVE		(4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #define DMA_CHUNKSIZE		(1<<22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #define DMA_RESERVED_BYTES	(DMA_RESERVE * DMA_CHUNKSIZE)
^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)  * Pick out the memory size.  We look for mem=size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)  * where size is "size[KkMm]"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int __init early_mem(char *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	char *endp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	size = memparse(p, &endp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	bootmem_lastpg = PFN_DOWN(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) early_param("mem", early_mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) void __init setup_arch_memory(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	/*  XXX Todo: this probably should be cleaned up  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	u32 *segtable = (u32 *) &swapper_pg_dir[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	u32 *segtable_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	 * Set up boot memory allocator
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	 * The Gorman book also talks about these functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	 * This needs to change for highmem setups.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	/*  Prior to this, bootmem_lastpg is actually mem size  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	bootmem_lastpg += ARCH_PFN_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	/* Memory size needs to be a multiple of 16M */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		~((BIG_KERNEL_PAGE_SIZE) - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	memblock_add(PHYS_OFFSET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		     (bootmem_lastpg - ARCH_PFN_OFFSET) << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	/* Reserve kernel text/data/bss */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	memblock_reserve(PHYS_OFFSET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			 (bootmem_startpg - ARCH_PFN_OFFSET) << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	 * Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	 * memory allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	min_low_pfn = ARCH_PFN_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	memblock_reserve(PFN_PHYS(max_low_pfn), DMA_RESERVED_BYTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	printk(KERN_INFO "bootmem_startpg:  0x%08lx\n", bootmem_startpg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	printk(KERN_INFO "bootmem_lastpg:  0x%08lx\n", bootmem_lastpg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	printk(KERN_INFO "min_low_pfn:  0x%08lx\n", min_low_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	printk(KERN_INFO "max_low_pfn:  0x%08lx\n", max_low_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	 * The default VM page tables (will be) populated with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	 * VA=PA+PAGE_OFFSET mapping.  We go in and invalidate entries
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	 * higher than what we have memory for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	/*  this is pointer arithmetic; each entry covers 4MB  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	segtable = segtable + (PAGE_OFFSET >> 22);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	/*  this actually only goes to the end of the first gig  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	segtable_end = segtable + (1<<(30-22));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	 * Move forward to the start of empty pages; take into account
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	 * phys_offset shift.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		for (i = 1 ; i <= DMA_RESERVE ; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 				| __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 				| __HEXAGON_C_UNC << 6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 				| __HVM_PDE_S_4MB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	printk(KERN_INFO "clearing segtable from %p to %p\n", segtable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		segtable_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	while (segtable < (segtable_end-8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		*(segtable++) = __HVM_PDE_S_INVALID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	/* stop the pointer at the device I/O 4MB page  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	printk(KERN_INFO "segtable = %p (should be equal to _K_io_map)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		segtable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) #if 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	/*  Other half of the early device table from vm_init_segtable. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	printk(KERN_INFO "&_K_init_devicetable = 0x%08x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		(unsigned long) _K_init_devicetable-PAGE_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	*segtable = ((u32) (unsigned long) _K_init_devicetable-PAGE_OFFSET) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		__HVM_PDE_S_4KB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	printk(KERN_INFO "*segtable = 0x%08x\n", *segtable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 *  The bootmem allocator seemingly just lives to feed memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 *  to the paging system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	paging_init();  /*  See Gorman Book, 2.3  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	 *  At this point, the page allocator is kind of initialized, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	 *  apparently no pages are available (just like with the bootmem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	 *  allocator), and need to be freed themselves via mem_init(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	 *  which is called by start_kernel() later on in the process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }