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-rw-r--r--arch/powerpc/mm/nohash/e500.c375
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diff --git a/arch/powerpc/mm/nohash/e500.c b/arch/powerpc/mm/nohash/e500.c
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Modifications by Kumar Gala (galak@kernel.crashing.org) to support
+ * E500 Book E processors.
+ *
+ * Copyright 2004,2010 Freescale Semiconductor, Inc.
+ *
+ * This file contains the routines for initializing the MMU
+ * on the 4xx series of chips.
+ * -- paulus
+ *
+ * Derived from arch/ppc/mm/init.c:
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
+ * and Cort Dougan (PReP) (cort@cs.nmt.edu)
+ * Copyright (C) 1996 Paul Mackerras
+ *
+ * Derived from "arch/i386/mm/init.c"
+ * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/stddef.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+
+#include <asm/io.h>
+#include <asm/mmu_context.h>
+#include <asm/mmu.h>
+#include <linux/uaccess.h>
+#include <asm/smp.h>
+#include <asm/machdep.h>
+#include <asm/setup.h>
+#include <asm/paca.h>
+
+#include <mm/mmu_decl.h>
+
+unsigned int tlbcam_index;
+
+struct tlbcam TLBCAM[NUM_TLBCAMS];
+
+static struct {
+ unsigned long start;
+ unsigned long limit;
+ phys_addr_t phys;
+} tlbcam_addrs[NUM_TLBCAMS];
+
+#ifdef CONFIG_PPC_85xx
+/*
+ * Return PA for this VA if it is mapped by a CAM, or 0
+ */
+phys_addr_t v_block_mapped(unsigned long va)
+{
+ int b;
+ for (b = 0; b < tlbcam_index; ++b)
+ if (va >= tlbcam_addrs[b].start && va < tlbcam_addrs[b].limit)
+ return tlbcam_addrs[b].phys + (va - tlbcam_addrs[b].start);
+ return 0;
+}
+
+/*
+ * Return VA for a given PA or 0 if not mapped
+ */
+unsigned long p_block_mapped(phys_addr_t pa)
+{
+ int b;
+ for (b = 0; b < tlbcam_index; ++b)
+ if (pa >= tlbcam_addrs[b].phys
+ && pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start)
+ +tlbcam_addrs[b].phys)
+ return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys);
+ return 0;
+}
+#endif
+
+/*
+ * Set up a variable-size TLB entry (tlbcam). The parameters are not checked;
+ * in particular size must be a power of 4 between 4k and the max supported by
+ * an implementation; max may further be limited by what can be represented in
+ * an unsigned long (for example, 32-bit implementations cannot support a 4GB
+ * size).
+ */
+static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
+ unsigned long size, unsigned long flags, unsigned int pid)
+{
+ unsigned int tsize;
+
+ tsize = __ilog2(size) - 10;
+
+#if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC)
+ if ((flags & _PAGE_NO_CACHE) == 0)
+ flags |= _PAGE_COHERENT;
+#endif
+
+ TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index) | MAS0_NV(index+1);
+ TLBCAM[index].MAS1 = MAS1_VALID | MAS1_IPROT | MAS1_TSIZE(tsize) | MAS1_TID(pid);
+ TLBCAM[index].MAS2 = virt & PAGE_MASK;
+
+ TLBCAM[index].MAS2 |= (flags & _PAGE_WRITETHRU) ? MAS2_W : 0;
+ TLBCAM[index].MAS2 |= (flags & _PAGE_NO_CACHE) ? MAS2_I : 0;
+ TLBCAM[index].MAS2 |= (flags & _PAGE_COHERENT) ? MAS2_M : 0;
+ TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0;
+ TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
+
+ TLBCAM[index].MAS3 = (phys & MAS3_RPN) | MAS3_SR;
+ TLBCAM[index].MAS3 |= (flags & _PAGE_RW) ? MAS3_SW : 0;
+ if (mmu_has_feature(MMU_FTR_BIG_PHYS))
+ TLBCAM[index].MAS7 = (u64)phys >> 32;
+
+ /* Below is unlikely -- only for large user pages or similar */
+ if (pte_user(__pte(flags))) {
+ TLBCAM[index].MAS3 |= MAS3_UR;
+ TLBCAM[index].MAS3 |= (flags & _PAGE_EXEC) ? MAS3_UX : 0;
+ TLBCAM[index].MAS3 |= (flags & _PAGE_RW) ? MAS3_UW : 0;
+ } else {
+ TLBCAM[index].MAS3 |= (flags & _PAGE_EXEC) ? MAS3_SX : 0;
+ }
+
+ tlbcam_addrs[index].start = virt;
+ tlbcam_addrs[index].limit = virt + size - 1;
+ tlbcam_addrs[index].phys = phys;
+}
+
+static unsigned long calc_cam_sz(unsigned long ram, unsigned long virt,
+ phys_addr_t phys)
+{
+ unsigned int camsize = __ilog2(ram);
+ unsigned int align = __ffs(virt | phys);
+ unsigned long max_cam;
+
+ if ((mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
+ /* Convert (4^max) kB to (2^max) bytes */
+ max_cam = ((mfspr(SPRN_TLB1CFG) >> 16) & 0xf) * 2 + 10;
+ camsize &= ~1U;
+ align &= ~1U;
+ } else {
+ /* Convert (2^max) kB to (2^max) bytes */
+ max_cam = __ilog2(mfspr(SPRN_TLB1PS)) + 10;
+ }
+
+ if (camsize > align)
+ camsize = align;
+ if (camsize > max_cam)
+ camsize = max_cam;
+
+ return 1UL << camsize;
+}
+
+static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt,
+ unsigned long ram, int max_cam_idx,
+ bool dryrun, bool init)
+{
+ int i;
+ unsigned long amount_mapped = 0;
+ unsigned long boundary;
+
+ if (strict_kernel_rwx_enabled())
+ boundary = (unsigned long)(_sinittext - _stext);
+ else
+ boundary = ram;
+
+ /* Calculate CAM values */
+ for (i = 0; boundary && i < max_cam_idx; i++) {
+ unsigned long cam_sz;
+ pgprot_t prot = init ? PAGE_KERNEL_X : PAGE_KERNEL_ROX;
+
+ cam_sz = calc_cam_sz(boundary, virt, phys);
+ if (!dryrun)
+ settlbcam(i, virt, phys, cam_sz, pgprot_val(prot), 0);
+
+ boundary -= cam_sz;
+ amount_mapped += cam_sz;
+ virt += cam_sz;
+ phys += cam_sz;
+ }
+ for (ram -= amount_mapped; ram && i < max_cam_idx; i++) {
+ unsigned long cam_sz;
+ pgprot_t prot = init ? PAGE_KERNEL_X : PAGE_KERNEL;
+
+ cam_sz = calc_cam_sz(ram, virt, phys);
+ if (!dryrun)
+ settlbcam(i, virt, phys, cam_sz, pgprot_val(prot), 0);
+
+ ram -= cam_sz;
+ amount_mapped += cam_sz;
+ virt += cam_sz;
+ phys += cam_sz;
+ }
+
+ if (dryrun)
+ return amount_mapped;
+
+ if (init) {
+ loadcam_multi(0, i, max_cam_idx);
+ tlbcam_index = i;
+ } else {
+ loadcam_multi(0, i, 0);
+ WARN_ON(i > tlbcam_index);
+ }
+
+#ifdef CONFIG_PPC64
+ get_paca()->tcd.esel_next = i;
+ get_paca()->tcd.esel_max = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
+ get_paca()->tcd.esel_first = i;
+#endif
+
+ return amount_mapped;
+}
+
+unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx, bool dryrun, bool init)
+{
+ unsigned long virt = PAGE_OFFSET;
+ phys_addr_t phys = memstart_addr;
+
+ return map_mem_in_cams_addr(phys, virt, ram, max_cam_idx, dryrun, init);
+}
+
+#ifdef CONFIG_PPC32
+
+#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
+#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
+#endif
+
+unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
+{
+ return tlbcam_addrs[tlbcam_index - 1].limit - PAGE_OFFSET + 1;
+}
+
+void flush_instruction_cache(void)
+{
+ unsigned long tmp;
+
+ tmp = mfspr(SPRN_L1CSR1);
+ tmp |= L1CSR1_ICFI | L1CSR1_ICLFR;
+ mtspr(SPRN_L1CSR1, tmp);
+ isync();
+}
+
+/*
+ * MMU_init_hw does the chip-specific initialization of the MMU hardware.
+ */
+void __init MMU_init_hw(void)
+{
+ flush_instruction_cache();
+}
+
+static unsigned long __init tlbcam_sz(int idx)
+{
+ return tlbcam_addrs[idx].limit - tlbcam_addrs[idx].start + 1;
+}
+
+void __init adjust_total_lowmem(void)
+{
+ unsigned long ram;
+ int i;
+
+ /* adjust lowmem size to __max_low_memory */
+ ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);
+
+ i = switch_to_as1();
+ __max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, false, true);
+ restore_to_as0(i, 0, NULL, 1);
+
+ pr_info("Memory CAM mapping: ");
+ for (i = 0; i < tlbcam_index - 1; i++)
+ pr_cont("%lu/", tlbcam_sz(i) >> 20);
+ pr_cont("%lu Mb, residual: %dMb\n", tlbcam_sz(tlbcam_index - 1) >> 20,
+ (unsigned int)((total_lowmem - __max_low_memory) >> 20));
+
+ memblock_set_current_limit(memstart_addr + __max_low_memory);
+}
+
+#ifdef CONFIG_STRICT_KERNEL_RWX
+void mmu_mark_rodata_ro(void)
+{
+ unsigned long remapped;
+
+ remapped = map_mem_in_cams(__max_low_memory, CONFIG_LOWMEM_CAM_NUM, false, false);
+
+ WARN_ON(__max_low_memory != remapped);
+}
+#endif
+
+void mmu_mark_initmem_nx(void)
+{
+ /* Everything is done in mmu_mark_rodata_ro() */
+}
+
+void setup_initial_memory_limit(phys_addr_t first_memblock_base,
+ phys_addr_t first_memblock_size)
+{
+ phys_addr_t limit = first_memblock_base + first_memblock_size;
+
+ /* 64M mapped initially according to head_fsl_booke.S */
+ memblock_set_current_limit(min_t(u64, limit, 0x04000000));
+}
+
+#ifdef CONFIG_RELOCATABLE
+int __initdata is_second_reloc;
+notrace void __init relocate_init(u64 dt_ptr, phys_addr_t start)
+{
+ unsigned long base = kernstart_virt_addr;
+ phys_addr_t size;
+
+ kernstart_addr = start;
+ if (is_second_reloc) {
+ virt_phys_offset = PAGE_OFFSET - memstart_addr;
+ kaslr_late_init();
+ return;
+ }
+
+ /*
+ * Relocatable kernel support based on processing of dynamic
+ * relocation entries. Before we get the real memstart_addr,
+ * We will compute the virt_phys_offset like this:
+ * virt_phys_offset = stext.run - kernstart_addr
+ *
+ * stext.run = (KERNELBASE & ~0x3ffffff) +
+ * (kernstart_addr & 0x3ffffff)
+ * When we relocate, we have :
+ *
+ * (kernstart_addr & 0x3ffffff) = (stext.run & 0x3ffffff)
+ *
+ * hence:
+ * virt_phys_offset = (KERNELBASE & ~0x3ffffff) -
+ * (kernstart_addr & ~0x3ffffff)
+ *
+ */
+ start &= ~0x3ffffff;
+ base &= ~0x3ffffff;
+ virt_phys_offset = base - start;
+ early_get_first_memblock_info(__va(dt_ptr), &size);
+ /*
+ * We now get the memstart_addr, then we should check if this
+ * address is the same as what the PAGE_OFFSET map to now. If
+ * not we have to change the map of PAGE_OFFSET to memstart_addr
+ * and do a second relocation.
+ */
+ if (start != memstart_addr) {
+ int n;
+ long offset = start - memstart_addr;
+
+ is_second_reloc = 1;
+ n = switch_to_as1();
+ /* map a 64M area for the second relocation */
+ if (memstart_addr > start)
+ map_mem_in_cams(0x4000000, CONFIG_LOWMEM_CAM_NUM,
+ false, true);
+ else
+ map_mem_in_cams_addr(start, PAGE_OFFSET + offset,
+ 0x4000000, CONFIG_LOWMEM_CAM_NUM,
+ false, true);
+ restore_to_as0(n, offset, __va(dt_ptr), 1);
+ /* We should never reach here */
+ panic("Relocation error");
+ }
+
+ kaslr_early_init(__va(dt_ptr), size);
+}
+#endif
+#endif
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