unicore32 core architecture: low level entry and setup codes
This patch implements low level entry and setup codes.
Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/unicore32/kernel/setup.c b/arch/unicore32/kernel/setup.c
new file mode 100644
index 0000000..1e175a8
--- /dev/null
+++ b/arch/unicore32/kernel/setup.c
@@ -0,0 +1,360 @@
+/*
+ * linux/arch/unicore32/kernel/setup.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/utsname.h>
+#include <linux/initrd.h>
+#include <linux/console.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/screen_info.h>
+#include <linux/init.h>
+#include <linux/root_dev.h>
+#include <linux/cpu.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/memblock.h>
+#include <linux/elf.h>
+#include <linux/io.h>
+
+#include <asm/cputype.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/traps.h>
+
+#include "setup.h"
+
+#ifndef MEM_SIZE
+#define MEM_SIZE (16*1024*1024)
+#endif
+
+struct stack {
+ u32 irq[3];
+ u32 abt[3];
+ u32 und[3];
+} ____cacheline_aligned;
+
+static struct stack stacks[NR_CPUS];
+
+char elf_platform[ELF_PLATFORM_SIZE];
+EXPORT_SYMBOL(elf_platform);
+
+static char __initdata cmd_line[COMMAND_LINE_SIZE];
+
+static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
+
+/*
+ * Standard memory resources
+ */
+static struct resource mem_res[] = {
+ {
+ .name = "Video RAM",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_MEM
+ },
+ {
+ .name = "Kernel text",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_MEM
+ },
+ {
+ .name = "Kernel data",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_MEM
+ }
+};
+
+#define video_ram mem_res[0]
+#define kernel_code mem_res[1]
+#define kernel_data mem_res[2]
+
+/*
+ * These functions re-use the assembly code in head.S, which
+ * already provide the required functionality.
+ */
+static void __init setup_processor(void)
+{
+ printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
+ uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
+
+ sprintf(init_utsname()->machine, "puv3");
+ sprintf(elf_platform, "ucv2");
+}
+
+/*
+ * cpu_init - initialise one CPU.
+ *
+ * cpu_init sets up the per-CPU stacks.
+ */
+void cpu_init(void)
+{
+ unsigned int cpu = smp_processor_id();
+ struct stack *stk = &stacks[cpu];
+
+ /*
+ * setup stacks for re-entrant exception handlers
+ */
+ __asm__ (
+ "mov.a asr, %1\n\t"
+ "add sp, %0, %2\n\t"
+ "mov.a asr, %3\n\t"
+ "add sp, %0, %4\n\t"
+ "mov.a asr, %5\n\t"
+ "add sp, %0, %6\n\t"
+ "mov.a asr, %7"
+ :
+ : "r" (stk),
+ "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
+ "I" (offsetof(struct stack, irq[0])),
+ "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
+ "I" (offsetof(struct stack, abt[0])),
+ "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
+ "I" (offsetof(struct stack, und[0])),
+ "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
+ : "r30", "cc");
+}
+
+static int __init uc32_add_memory(unsigned long start, unsigned long size)
+{
+ struct membank *bank = &meminfo.bank[meminfo.nr_banks];
+
+ if (meminfo.nr_banks >= NR_BANKS) {
+ printk(KERN_CRIT "NR_BANKS too low, "
+ "ignoring memory at %#lx\n", start);
+ return -EINVAL;
+ }
+
+ /*
+ * Ensure that start/size are aligned to a page boundary.
+ * Size is appropriately rounded down, start is rounded up.
+ */
+ size -= start & ~PAGE_MASK;
+
+ bank->start = PAGE_ALIGN(start);
+ bank->size = size & PAGE_MASK;
+
+ /*
+ * Check whether this memory region has non-zero size or
+ * invalid node number.
+ */
+ if (bank->size == 0)
+ return -EINVAL;
+
+ meminfo.nr_banks++;
+ return 0;
+}
+
+/*
+ * Pick out the memory size. We look for mem=size@start,
+ * where start and size are "size[KkMm]"
+ */
+static int __init early_mem(char *p)
+{
+ static int usermem __initdata = 1;
+ unsigned long size, start;
+ char *endp;
+
+ /*
+ * If the user specifies memory size, we
+ * blow away any automatically generated
+ * size.
+ */
+ if (usermem) {
+ usermem = 0;
+ meminfo.nr_banks = 0;
+ }
+
+ start = PHYS_OFFSET;
+ size = memparse(p, &endp);
+ if (*endp == '@')
+ start = memparse(endp + 1, NULL);
+
+ uc32_add_memory(start, size);
+
+ return 0;
+}
+early_param("mem", early_mem);
+
+static void __init
+request_standard_resources(struct meminfo *mi)
+{
+ struct resource *res;
+ int i;
+
+ kernel_code.start = virt_to_phys(_stext);
+ kernel_code.end = virt_to_phys(_etext - 1);
+ kernel_data.start = virt_to_phys(_sdata);
+ kernel_data.end = virt_to_phys(_end - 1);
+
+ for (i = 0; i < mi->nr_banks; i++) {
+ if (mi->bank[i].size == 0)
+ continue;
+
+ res = alloc_bootmem_low(sizeof(*res));
+ res->name = "System RAM";
+ res->start = mi->bank[i].start;
+ res->end = mi->bank[i].start + mi->bank[i].size - 1;
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
+ request_resource(&iomem_resource, res);
+
+ if (kernel_code.start >= res->start &&
+ kernel_code.end <= res->end)
+ request_resource(res, &kernel_code);
+ if (kernel_data.start >= res->start &&
+ kernel_data.end <= res->end)
+ request_resource(res, &kernel_data);
+ }
+
+ video_ram.start = PKUNITY_UNIGFX_MMAP_BASE;
+ video_ram.end = PKUNITY_UNIGFX_MMAP_BASE + PKUNITY_UNIGFX_MMAP_SIZE;
+ request_resource(&iomem_resource, &video_ram);
+}
+
+static void (*init_machine)(void) __initdata;
+
+static int __init customize_machine(void)
+{
+ /* customizes platform devices, or adds new ones */
+ if (init_machine)
+ init_machine();
+ return 0;
+}
+arch_initcall(customize_machine);
+
+void __init setup_arch(char **cmdline_p)
+{
+ char *from = default_command_line;
+
+ setup_processor();
+
+ init_mm.start_code = (unsigned long) _stext;
+ init_mm.end_code = (unsigned long) _etext;
+ init_mm.end_data = (unsigned long) _edata;
+ init_mm.brk = (unsigned long) _end;
+
+ /* parse_early_param needs a boot_command_line */
+ strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
+
+ /* populate cmd_line too for later use, preserving boot_command_line */
+ strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
+ *cmdline_p = cmd_line;
+
+ parse_early_param();
+
+ uc32_memblock_init(&meminfo);
+
+ paging_init();
+ request_standard_resources(&meminfo);
+
+ cpu_init();
+
+ /*
+ * Set up various architecture-specific pointers
+ */
+ init_machine = puv3_core_init;
+
+#ifdef CONFIG_VT
+#if defined(CONFIG_VGA_CONSOLE)
+ conswitchp = &vga_con;
+#elif defined(CONFIG_DUMMY_CONSOLE)
+ conswitchp = &dummy_con;
+#endif
+#endif
+ early_trap_init();
+}
+
+static struct cpu cpuinfo_unicore;
+
+static int __init topology_init(void)
+{
+ int i;
+
+ for_each_possible_cpu(i)
+ register_cpu(&cpuinfo_unicore, i);
+
+ return 0;
+}
+subsys_initcall(topology_init);
+
+#ifdef CONFIG_HAVE_PROC_CPU
+static int __init proc_cpu_init(void)
+{
+ struct proc_dir_entry *res;
+
+ res = proc_mkdir("cpu", NULL);
+ if (!res)
+ return -ENOMEM;
+ return 0;
+}
+fs_initcall(proc_cpu_init);
+#endif
+
+static int c_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
+ (int)(uc32_cpuid >> 16) & 15, elf_platform);
+
+ seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
+ loops_per_jiffy / (500000/HZ),
+ (loops_per_jiffy / (5000/HZ)) % 100);
+
+ /* dump out the processor features */
+ seq_puts(m, "Features\t: CMOV UC-F64");
+
+ seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
+ seq_printf(m, "CPU architecture: 2\n");
+ seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
+
+ seq_printf(m, "Cache type\t: write-back\n"
+ "Cache clean\t: cp0 c5 ops\n"
+ "Cache lockdown\t: not support\n"
+ "Cache format\t: Harvard\n");
+
+ seq_puts(m, "\n");
+
+ seq_printf(m, "Hardware\t: PKUnity v3\n");
+
+ return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos < 1 ? (void *)1 : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return NULL;
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+const struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = c_show
+};
