![Vineet Gupta](/assets/img/avatar_default.png)
The flat DT (currently embedded in vmlinux) is in .init section. The unflattened/binary tree doesn't copy strings through and references them from orig flat DT - which could cause catestrohpy if of_* APIs are called post init, say from a driver which is a loadable module. Reported-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
474 lines
12 KiB
C
474 lines
12 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/delay.h>
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#include <linux/root_dev.h>
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#include <linux/console.h>
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#include <linux/module.h>
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#include <linux/cpu.h>
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#include <linux/of_fdt.h>
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#include <asm/sections.h>
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#include <asm/arcregs.h>
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#include <asm/tlb.h>
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#include <asm/cache.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/irq.h>
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#include <asm/arcregs.h>
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#include <asm/prom.h>
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#include <asm/unwind.h>
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#include <asm/clk.h>
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#include <asm/mach_desc.h>
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#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
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int running_on_hw = 1; /* vs. on ISS */
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char __initdata command_line[COMMAND_LINE_SIZE];
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struct machine_desc *machine_desc __initdata;
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struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
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struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
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void __init read_arc_build_cfg_regs(void)
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{
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struct bcr_perip uncached_space;
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
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FIX_PTR(cpu);
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READ_BCR(AUX_IDENTITY, cpu->core);
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cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
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cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
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if (cpu->vec_base == 0)
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cpu->vec_base = (unsigned int)_int_vec_base_lds;
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READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
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cpu->uncached_base = uncached_space.start << 24;
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cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR);
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cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR);
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cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR);
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cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR);
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cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR);
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READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul);
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cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
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cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
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/* Note that we read the CCM BCRs independent of kernel config
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* This is to catch the cases where user doesn't know that
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* CCMs are present in hardware build
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*/
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{
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struct bcr_iccm iccm;
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struct bcr_dccm dccm;
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struct bcr_dccm_base dccm_base;
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unsigned int bcr_32bit_val;
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bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
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if (bcr_32bit_val) {
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iccm = *((struct bcr_iccm *)&bcr_32bit_val);
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cpu->iccm.base_addr = iccm.base << 16;
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cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
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}
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bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
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if (bcr_32bit_val) {
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dccm = *((struct bcr_dccm *)&bcr_32bit_val);
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cpu->dccm.sz = 0x800 << (dccm.sz);
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READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
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cpu->dccm.base_addr = dccm_base.addr << 8;
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}
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}
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READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
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read_decode_mmu_bcr();
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read_decode_cache_bcr();
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READ_BCR(ARC_REG_FP_BCR, cpu->fp);
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READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
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}
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static const struct cpuinfo_data arc_cpu_tbl[] = {
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{ {0x10, "ARCTangent A5"}, 0x1F},
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{ {0x20, "ARC 600" }, 0x2F},
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{ {0x30, "ARC 700" }, 0x33},
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{ {0x34, "ARC 700 R4.10"}, 0x34},
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{ {0x00, NULL } }
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};
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char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
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{
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int n = 0;
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
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struct bcr_identity *core = &cpu->core;
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const struct cpuinfo_data *tbl;
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int be = 0;
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#ifdef CONFIG_CPU_BIG_ENDIAN
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be = 1;
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#endif
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FIX_PTR(cpu);
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n += scnprintf(buf + n, len - n,
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"\nARC IDENTITY\t: Family [%#02x]"
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" Cpu-id [%#02x] Chip-id [%#4x]\n",
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core->family, core->cpu_id,
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core->chip_id);
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for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
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if ((core->family >= tbl->info.id) &&
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(core->family <= tbl->up_range)) {
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n += scnprintf(buf + n, len - n,
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"processor\t: %s %s\n",
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tbl->info.str,
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be ? "[Big Endian]" : "");
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break;
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}
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}
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if (tbl->info.id == 0)
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n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
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n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
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(unsigned int)(arc_get_core_freq() / 1000000),
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(unsigned int)(arc_get_core_freq() / 10000) % 100);
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n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
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(cpu->timers & 0x200) ? "TIMER1" : "",
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(cpu->timers & 0x100) ? "TIMER0" : "");
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n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
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cpu->vec_base);
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n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
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cpu->uncached_base);
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return buf;
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}
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static const struct id_to_str mul_type_nm[] = {
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{ 0x0, "N/A"},
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{ 0x1, "32x32 (spl Result Reg)" },
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{ 0x2, "32x32 (ANY Result Reg)" }
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};
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static const struct id_to_str mac_mul_nm[] = {
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{0x0, "N/A"},
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{0x1, "N/A"},
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{0x2, "Dual 16 x 16"},
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{0x3, "N/A"},
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{0x4, "32x16"},
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{0x5, "N/A"},
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{0x6, "Dual 16x16 and 32x16"}
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};
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char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
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{
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int n = 0;
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
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FIX_PTR(cpu);
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#define IS_AVAIL1(var, str) ((var) ? str : "")
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#define IS_AVAIL2(var, str) ((var == 0x2) ? str : "")
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#define IS_USED(var) ((var) ? "(in-use)" : "(not used)")
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n += scnprintf(buf + n, len - n,
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"Extn [700-Base]\t: %s %s %s %s %s %s\n",
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IS_AVAIL2(cpu->extn.norm, "norm,"),
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IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"),
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IS_AVAIL1(cpu->extn.swap, "swap,"),
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IS_AVAIL2(cpu->extn.minmax, "minmax,"),
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IS_AVAIL1(cpu->extn.crc, "crc,"),
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IS_AVAIL2(cpu->extn.ext_arith, "ext-arith"));
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n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
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mul_type_nm[cpu->extn.mul].str);
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n += scnprintf(buf + n, len - n, " MAC MPY: %s\n",
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mac_mul_nm[cpu->extn_mac_mul.type].str);
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if (cpu->core.family == 0x34) {
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n += scnprintf(buf + n, len - n,
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"Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n",
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IS_USED(__CONFIG_ARC_HAS_LLSC_VAL),
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IS_USED(__CONFIG_ARC_HAS_SWAPE_VAL),
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IS_USED(__CONFIG_ARC_HAS_RTSC_VAL));
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}
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n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
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!(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
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if (cpu->dccm.sz)
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n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
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cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
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if (cpu->iccm.sz)
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n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
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cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
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n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
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!(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
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if (cpu->fp.ver)
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n += scnprintf(buf + n, len - n, "SP [v%d] %s",
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cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
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if (cpu->dpfp.ver)
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n += scnprintf(buf + n, len - n, "DP [v%d] %s",
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cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
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n += scnprintf(buf + n, len - n, "\n");
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#ifdef _ASM_GENERIC_UNISTD_H
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n += scnprintf(buf + n, len - n,
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"OS ABI [v2]\t: asm-generic/{unistd,stat,fcntl}\n");
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#endif
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return buf;
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}
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void __init arc_chk_ccms(void)
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{
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#if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM)
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
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#ifdef CONFIG_ARC_HAS_DCCM
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/*
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* DCCM can be arbit placed in hardware.
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* Make sure it's placement/sz matches what Linux is built with
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*/
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if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
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panic("Linux built with incorrect DCCM Base address\n");
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if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
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panic("Linux built with incorrect DCCM Size\n");
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#endif
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#ifdef CONFIG_ARC_HAS_ICCM
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if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
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panic("Linux built with incorrect ICCM Size\n");
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#endif
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#endif
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}
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/*
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* Ensure that FP hardware and kernel config match
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* -If hardware contains DPFP, kernel needs to save/restore FPU state
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* across context switches
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* -If hardware lacks DPFP, but kernel configured to save FPU state then
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* kernel trying to access non-existant DPFP regs will crash
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*
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* We only check for Dbl precision Floating Point, because only DPFP
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* hardware has dedicated regs which need to be saved/restored on ctx-sw
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* (Single Precision uses core regs), thus kernel is kind of oblivious to it
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*/
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void __init arc_chk_fpu(void)
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{
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
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if (cpu->dpfp.ver) {
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#ifndef CONFIG_ARC_FPU_SAVE_RESTORE
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pr_warn("DPFP support broken in this kernel...\n");
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#endif
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} else {
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#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
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panic("H/w lacks DPFP support, apps won't work\n");
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#endif
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}
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}
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/*
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* Initialize and setup the processor core
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* This is called by all the CPUs thus should not do special case stuff
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* such as only for boot CPU etc
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*/
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void __init setup_processor(void)
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{
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char str[512];
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int cpu_id = smp_processor_id();
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read_arc_build_cfg_regs();
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arc_init_IRQ();
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printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
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arc_mmu_init();
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arc_cache_init();
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arc_chk_ccms();
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printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
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#ifdef CONFIG_SMP
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printk(arc_platform_smp_cpuinfo());
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#endif
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arc_chk_fpu();
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}
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void __init setup_arch(char **cmdline_p)
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{
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#ifdef CONFIG_CMDLINE_UBOOT
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/* Make sure that a whitespace is inserted before */
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strlcat(command_line, " ", sizeof(command_line));
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#endif
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/*
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* Append .config cmdline to base command line, which might already
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* contain u-boot "bootargs" (handled by head.S, if so configured)
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*/
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strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
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/* Save unparsed command line copy for /proc/cmdline */
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strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
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*cmdline_p = command_line;
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machine_desc = setup_machine_fdt(__dtb_start);
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if (!machine_desc)
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panic("Embedded DT invalid\n");
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/* To force early parsing of things like mem=xxx */
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parse_early_param();
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/* Platform/board specific: e.g. early console registration */
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if (machine_desc->init_early)
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machine_desc->init_early();
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setup_processor();
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#ifdef CONFIG_SMP
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smp_init_cpus();
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#endif
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setup_arch_memory();
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/* copy flat DT out of .init and then unflatten it */
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copy_devtree();
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unflatten_device_tree();
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/* Can be issue if someone passes cmd line arg "ro"
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* But that is unlikely so keeping it as it is
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*/
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root_mountflags &= ~MS_RDONLY;
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console_verbose();
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#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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arc_unwind_init();
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arc_unwind_setup();
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}
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static int __init customize_machine(void)
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{
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/* Add platform devices */
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if (machine_desc->init_machine)
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machine_desc->init_machine();
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return 0;
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}
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arch_initcall(customize_machine);
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static int __init init_late_machine(void)
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{
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if (machine_desc->init_late)
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machine_desc->init_late();
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return 0;
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}
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late_initcall(init_late_machine);
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/*
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* Get CPU information for use by the procfs.
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*/
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#define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
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#define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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char *str;
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int cpu_id = ptr_to_cpu(v);
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str = (char *)__get_free_page(GFP_TEMPORARY);
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if (!str)
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goto done;
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seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
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seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
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loops_per_jiffy / (500000 / HZ),
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(loops_per_jiffy / (5000 / HZ)) % 100);
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seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
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seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
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seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
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#ifdef CONFIG_SMP
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seq_printf(m, arc_platform_smp_cpuinfo());
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#endif
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free_page((unsigned long)str);
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done:
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seq_printf(m, "\n\n");
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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/*
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* Callback returns cpu-id to iterator for show routine, NULL to stop.
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* However since NULL is also a valid cpu-id (0), we use a round-about
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* way to pass it w/o having to kmalloc/free a 2 byte string.
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* Encode cpu-id as 0xFFcccc, which is decoded by show routine.
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*/
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return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo
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};
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static DEFINE_PER_CPU(struct cpu, cpu_topology);
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static int __init topology_init(void)
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{
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int cpu;
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for_each_present_cpu(cpu)
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register_cpu(&per_cpu(cpu_topology, cpu), cpu);
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return 0;
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}
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subsys_initcall(topology_init);
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