arch/powerpc/mm/nohash/fsl

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This source file includes following definitions.
tlbcam_sz
v_block_mapped
p_block_mapped
settlbcam
calc_cam_sz
map_mem_in_cams_addr
map_mem_in_cams
mmu_mapin_ram
MMU_init_hw
adjust_total_lowmem
setup_initial_memory_limit
relocate_init
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Modifications by Kumar Gala (galak@kernel.crashing.org) to support
   4  * E500 Book E processors.
   5  *
   6  * Copyright 2004,2010 Freescale Semiconductor, Inc.
   7  *
   8  * This file contains the routines for initializing the MMU
   9  * on the 4xx series of chips.
  10  *  -- paulus
  11  *
  12  *  Derived from arch/ppc/mm/init.c:
  13  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  14  *
  15  *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
  16  *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
  17  *    Copyright (C) 1996 Paul Mackerras
  18  *
  19  *  Derived from "arch/i386/mm/init.c"
  20  *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
  21  */
  22 
  23 #include <linux/signal.h>
  24 #include <linux/sched.h>
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/string.h>
  28 #include <linux/types.h>
  29 #include <linux/ptrace.h>
  30 #include <linux/mman.h>
  31 #include <linux/mm.h>
  32 #include <linux/swap.h>
  33 #include <linux/stddef.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/init.h>
  36 #include <linux/delay.h>
  37 #include <linux/highmem.h>
  38 #include <linux/memblock.h>
  39 
  40 #include <asm/pgalloc.h>
  41 #include <asm/prom.h>
  42 #include <asm/io.h>
  43 #include <asm/mmu_context.h>
  44 #include <asm/pgtable.h>
  45 #include <asm/mmu.h>
  46 #include <linux/uaccess.h>
  47 #include <asm/smp.h>
  48 #include <asm/machdep.h>
  49 #include <asm/setup.h>
  50 #include <asm/paca.h>
  51 
  52 #include <mm/mmu_decl.h>
  53 
  54 unsigned int tlbcam_index;
  55 
  56 #define NUM_TLBCAMS     (64)
  57 struct tlbcam TLBCAM[NUM_TLBCAMS];
  58 
  59 struct tlbcamrange {
  60         unsigned long start;
  61         unsigned long limit;
  62         phys_addr_t phys;
  63 } tlbcam_addrs[NUM_TLBCAMS];
  64 
  65 unsigned long tlbcam_sz(int idx)
  66 {
  67         return tlbcam_addrs[idx].limit - tlbcam_addrs[idx].start + 1;
  68 }
  69 
  70 #ifdef CONFIG_FSL_BOOKE
  71 /*
  72  * Return PA for this VA if it is mapped by a CAM, or 0
  73  */
  74 phys_addr_t v_block_mapped(unsigned long va)
  75 {
  76         int b;
  77         for (b = 0; b < tlbcam_index; ++b)
  78                 if (va >= tlbcam_addrs[b].start && va < tlbcam_addrs[b].limit)
  79                         return tlbcam_addrs[b].phys + (va - tlbcam_addrs[b].start);
  80         return 0;
  81 }
  82 
  83 /*
  84  * Return VA for a given PA or 0 if not mapped
  85  */
  86 unsigned long p_block_mapped(phys_addr_t pa)
  87 {
  88         int b;
  89         for (b = 0; b < tlbcam_index; ++b)
  90                 if (pa >= tlbcam_addrs[b].phys
  91                         && pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start)
  92                               +tlbcam_addrs[b].phys)
  93                         return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys);
  94         return 0;
  95 }
  96 #endif
  97 
  98 /*
  99  * Set up a variable-size TLB entry (tlbcam). The parameters are not checked;
 100  * in particular size must be a power of 4 between 4k and the max supported by
 101  * an implementation; max may further be limited by what can be represented in
 102  * an unsigned long (for example, 32-bit implementations cannot support a 4GB
 103  * size).
 104  */
 105 static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
 106                 unsigned long size, unsigned long flags, unsigned int pid)
 107 {
 108         unsigned int tsize;
 109 
 110         tsize = __ilog2(size) - 10;
 111 
 112 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC)
 113         if ((flags & _PAGE_NO_CACHE) == 0)
 114                 flags |= _PAGE_COHERENT;
 115 #endif
 116 
 117         TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index) | MAS0_NV(index+1);
 118         TLBCAM[index].MAS1 = MAS1_VALID | MAS1_IPROT | MAS1_TSIZE(tsize) | MAS1_TID(pid);
 119         TLBCAM[index].MAS2 = virt & PAGE_MASK;
 120 
 121         TLBCAM[index].MAS2 |= (flags & _PAGE_WRITETHRU) ? MAS2_W : 0;
 122         TLBCAM[index].MAS2 |= (flags & _PAGE_NO_CACHE) ? MAS2_I : 0;
 123         TLBCAM[index].MAS2 |= (flags & _PAGE_COHERENT) ? MAS2_M : 0;
 124         TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0;
 125         TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
 126 
 127         TLBCAM[index].MAS3 = (phys & MAS3_RPN) | MAS3_SX | MAS3_SR;
 128         TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0);
 129         if (mmu_has_feature(MMU_FTR_BIG_PHYS))
 130                 TLBCAM[index].MAS7 = (u64)phys >> 32;
 131 
 132         /* Below is unlikely -- only for large user pages or similar */
 133         if (pte_user(__pte(flags))) {
 134            TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
 135            TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
 136         }
 137 
 138         tlbcam_addrs[index].start = virt;
 139         tlbcam_addrs[index].limit = virt + size - 1;
 140         tlbcam_addrs[index].phys = phys;
 141 }
 142 
 143 unsigned long calc_cam_sz(unsigned long ram, unsigned long virt,
 144                           phys_addr_t phys)
 145 {
 146         unsigned int camsize = __ilog2(ram);
 147         unsigned int align = __ffs(virt | phys);
 148         unsigned long max_cam;
 149 
 150         if ((mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
 151                 /* Convert (4^max) kB to (2^max) bytes */
 152                 max_cam = ((mfspr(SPRN_TLB1CFG) >> 16) & 0xf) * 2 + 10;
 153                 camsize &= ~1U;
 154                 align &= ~1U;
 155         } else {
 156                 /* Convert (2^max) kB to (2^max) bytes */
 157                 max_cam = __ilog2(mfspr(SPRN_TLB1PS)) + 10;
 158         }
 159 
 160         if (camsize > align)
 161                 camsize = align;
 162         if (camsize > max_cam)
 163                 camsize = max_cam;
 164 
 165         return 1UL << camsize;
 166 }
 167 
 168 static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt,
 169                                         unsigned long ram, int max_cam_idx,
 170                                         bool dryrun)
 171 {
 172         int i;
 173         unsigned long amount_mapped = 0;
 174 
 175         /* Calculate CAM values */
 176         for (i = 0; ram && i < max_cam_idx; i++) {
 177                 unsigned long cam_sz;
 178 
 179                 cam_sz = calc_cam_sz(ram, virt, phys);
 180                 if (!dryrun)
 181                         settlbcam(i, virt, phys, cam_sz,
 182                                   pgprot_val(PAGE_KERNEL_X), 0);
 183 
 184                 ram -= cam_sz;
 185                 amount_mapped += cam_sz;
 186                 virt += cam_sz;
 187                 phys += cam_sz;
 188         }
 189 
 190         if (dryrun)
 191                 return amount_mapped;
 192 
 193         loadcam_multi(0, i, max_cam_idx);
 194         tlbcam_index = i;
 195 
 196 #ifdef CONFIG_PPC64
 197         get_paca()->tcd.esel_next = i;
 198         get_paca()->tcd.esel_max = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
 199         get_paca()->tcd.esel_first = i;
 200 #endif
 201 
 202         return amount_mapped;
 203 }
 204 
 205 unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx, bool dryrun)
 206 {
 207         unsigned long virt = PAGE_OFFSET;
 208         phys_addr_t phys = memstart_addr;
 209 
 210         return map_mem_in_cams_addr(phys, virt, ram, max_cam_idx, dryrun);
 211 }
 212 
 213 #ifdef CONFIG_PPC32
 214 
 215 #if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
 216 #error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
 217 #endif
 218 
 219 unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
 220 {
 221         return tlbcam_addrs[tlbcam_index - 1].limit - PAGE_OFFSET + 1;
 222 }
 223 
 224 /*
 225  * MMU_init_hw does the chip-specific initialization of the MMU hardware.
 226  */
 227 void __init MMU_init_hw(void)
 228 {
 229         flush_instruction_cache();
 230 }
 231 
 232 void __init adjust_total_lowmem(void)
 233 {
 234         unsigned long ram;
 235         int i;
 236 
 237         /* adjust lowmem size to __max_low_memory */
 238         ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);
 239 
 240         i = switch_to_as1();
 241         __max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, false);
 242         restore_to_as0(i, 0, 0, 1);
 243 
 244         pr_info("Memory CAM mapping: ");
 245         for (i = 0; i < tlbcam_index - 1; i++)
 246                 pr_cont("%lu/", tlbcam_sz(i) >> 20);
 247         pr_cont("%lu Mb, residual: %dMb\n", tlbcam_sz(tlbcam_index - 1) >> 20,
 248                 (unsigned int)((total_lowmem - __max_low_memory) >> 20));
 249 
 250         memblock_set_current_limit(memstart_addr + __max_low_memory);
 251 }
 252 
 253 void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 254                                 phys_addr_t first_memblock_size)
 255 {
 256         phys_addr_t limit = first_memblock_base + first_memblock_size;
 257 
 258         /* 64M mapped initially according to head_fsl_booke.S */
 259         memblock_set_current_limit(min_t(u64, limit, 0x04000000));
 260 }
 261 
 262 #ifdef CONFIG_RELOCATABLE
 263 int __initdata is_second_reloc;
 264 notrace void __init relocate_init(u64 dt_ptr, phys_addr_t start)
 265 {
 266         unsigned long base = KERNELBASE;
 267 
 268         kernstart_addr = start;
 269         if (is_second_reloc) {
 270                 virt_phys_offset = PAGE_OFFSET - memstart_addr;
 271                 return;
 272         }
 273 
 274         /*
 275          * Relocatable kernel support based on processing of dynamic
 276          * relocation entries. Before we get the real memstart_addr,
 277          * We will compute the virt_phys_offset like this:
 278          * virt_phys_offset = stext.run - kernstart_addr
 279          *
 280          * stext.run = (KERNELBASE & ~0x3ffffff) +
 281          *                              (kernstart_addr & 0x3ffffff)
 282          * When we relocate, we have :
 283          *
 284          *      (kernstart_addr & 0x3ffffff) = (stext.run & 0x3ffffff)
 285          *
 286          * hence:
 287          *  virt_phys_offset = (KERNELBASE & ~0x3ffffff) -
 288          *                              (kernstart_addr & ~0x3ffffff)
 289          *
 290          */
 291         start &= ~0x3ffffff;
 292         base &= ~0x3ffffff;
 293         virt_phys_offset = base - start;
 294         early_get_first_memblock_info(__va(dt_ptr), NULL);
 295         /*
 296          * We now get the memstart_addr, then we should check if this
 297          * address is the same as what the PAGE_OFFSET map to now. If
 298          * not we have to change the map of PAGE_OFFSET to memstart_addr
 299          * and do a second relocation.
 300          */
 301         if (start != memstart_addr) {
 302                 int n;
 303                 long offset = start - memstart_addr;
 304 
 305                 is_second_reloc = 1;
 306                 n = switch_to_as1();
 307                 /* map a 64M area for the second relocation */
 308                 if (memstart_addr > start)
 309                         map_mem_in_cams(0x4000000, CONFIG_LOWMEM_CAM_NUM,
 310                                         false);
 311                 else
 312                         map_mem_in_cams_addr(start, PAGE_OFFSET + offset,
 313                                         0x4000000, CONFIG_LOWMEM_CAM_NUM,
 314                                         false);
 315                 restore_to_as0(n, offset, __va(dt_ptr), 1);
 316                 /* We should never reach here */
 317                 panic("Relocation error");
 318         }
 319 }
 320 #endif
 321 #endif
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root/arch/powerpc/mm/nohash/fsl_booke.c

DEFINITIONS
