[PATCH 16/16] h8300: misc functions

[Yoshinori Sato <ysato@users.sourceforge.jp>]

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>

 create mode 100644 arch/h8300/kernel/Makefile
 create mode 100644 arch/h8300/kernel/asm-offsets.c
 create mode 100644 arch/h8300/kernel/clk.c
 create mode 100644 arch/h8300/kernel/h8300_ksyms.c
 create mode 100644 arch/h8300/kernel/module.c
 create mode 100644 arch/h8300/kernel/process.c
 create mode 100644 arch/h8300/kernel/setup.c
 create mode 100644 arch/h8300/kernel/sim-console.c
 create mode 100644 arch/h8300/kernel/sys_h8300.c
 create mode 100644 arch/h8300/kernel/vmlinux.lds.S

diff --git a/arch/h8300/kernel/Makefile b/arch/h8300/kernel/Makefile
new file mode 100644
index 0000000..6d27cba
--- /dev/null
+++ b/arch/h8300/kernel/Makefile
@@ -0,0 +1,23 @@
+#
+# Makefile for the linux kernel.
+#
+
+extra-y := vmlinux.lds
+
+obj-y := process.o traps.o ptrace.o \
+	 sys_h8300.o time.o signal.o \
+         setup.o syscalls.o irq.o \
+	 entry.o clk.o timer/
+
+obj-$(CONFIG_ROMKERNEL) += head_rom.o
+obj-$(CONFIG_RAMKERNEL) += head_ram.o
+obj-$(CONFIG_CPU_H8300H) += ptrace_h.o irq_h.o
+obj-$(CONFIG_CPU_H8S) += ptrace_s.o irq_s.o
+
+obj-$(CONFIG_MODULES) += module.o h8300_ksyms.o
+obj-$(CONFIG_H8300H_SIM) += sim-console.o
+obj-$(CONFIG_H8S_SIM) += sim-console.o
+
+obj-$(CONFIG_H83069) += cpu/h83069/
+obj-$(CONFIG_H8S2678) += cpu/h8s2678/
+
diff --git a/arch/h8300/kernel/asm-offsets.c b/arch/h8300/kernel/asm-offsets.c
new file mode 100644
index 0000000..71dad7f
--- /dev/null
+++ b/arch/h8300/kernel/asm-offsets.c
@@ -0,0 +1,59 @@
+/*
+ * This program is used to generate definitions needed by
+ * assembly language modules.
+ *
+ * We use the technique used in the OSF Mach kernel code:
+ * generate asm statements containing #defines,
+ * compile this file to assembler, and then extract the
+ * #defines from the assembly-language output.
+ */
+
+#include <linux/stddef.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/ptrace.h>
+#include <linux/hardirq.h>
+#include <linux/kbuild.h>
+#include <asm/irq.h>
+#include <asm/ptrace.h>
+
+int main(void)
+{
+	/* offsets into the task struct */
+	DEFINE(TASK_STATE, offsetof(struct task_struct, state));
+	DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
+	DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
+	DEFINE(TASK_BLOCKED, offsetof(struct task_struct, blocked));
+	DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
+	DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, stack));
+	DEFINE(TASK_MM, offsetof(struct task_struct, mm));
+	DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm));
+
+	/* offsets into the irq_cpustat_t struct */
+	DEFINE(CPUSTAT_SOFTIRQ_PENDING, offsetof(irq_cpustat_t, __softirq_pending));
+
+	/* offsets into the thread struct */
+	DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp));
+	DEFINE(THREAD_USP, offsetof(struct thread_struct, usp));
+	DEFINE(THREAD_CCR, offsetof(struct thread_struct, ccr));
+
+	/* offsets into the pt_regs struct */
+	DEFINE(LER0,  offsetof(struct pt_regs, er0)      - sizeof(long));
+	DEFINE(LER1,  offsetof(struct pt_regs, er1)      - sizeof(long));
+	DEFINE(LER2,  offsetof(struct pt_regs, er2)      - sizeof(long));
+	DEFINE(LER3,  offsetof(struct pt_regs, er3)      - sizeof(long));
+	DEFINE(LER4,  offsetof(struct pt_regs, er4)      - sizeof(long));
+	DEFINE(LER5,  offsetof(struct pt_regs, er5)      - sizeof(long));
+	DEFINE(LER6,  offsetof(struct pt_regs, er6)      - sizeof(long));
+	DEFINE(LORIG, offsetof(struct pt_regs, orig_er0) - sizeof(long));
+	DEFINE(LCCR,  offsetof(struct pt_regs, ccr)      - sizeof(long));
+	DEFINE(LVEC,  offsetof(struct pt_regs, vector)   - sizeof(long));
+#if defined(CONFIG_CPU_H8S)
+	DEFINE(LEXR,  offsetof(struct pt_regs, exr)      - sizeof(long));
+#endif
+	DEFINE(LRET,  offsetof(struct pt_regs, pc)       - sizeof(long));
+
+	DEFINE(PT_PTRACED, PT_PTRACED);
+
+	return 0;
+}
diff --git a/arch/h8300/kernel/clk.c b/arch/h8300/kernel/clk.c
new file mode 100644
index 0000000..0a3a0e7
--- /dev/null
+++ b/arch/h8300/kernel/clk.c
@@ -0,0 +1,52 @@
+/*
+ * linux/arch/h8300/kernel/clk.c
+ *
+ * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/compiler.h>
+#include <linux/clkdev.h>
+#include <asm/clk.h>
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	return clk->parent->rate;
+}
+EXPORT_SYMBOL(clk_get_rate)
+
+int clk_enable(struct clk *clk)
+{
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable)
+
+void clk_disable(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_disable)
+
+static struct clk master_clk;
+
+static struct clk peripheral_clk = {
+	.parent = &master_clk,
+};
+
+static struct clk_lookup lookups[] = {
+	{
+		.con_id = "master_clk",
+		.clk = &master_clk,
+	},
+	{
+		.con_id = "peripheral_clk",
+		.clk = &peripheral_clk,
+	},
+};
+
+int __init h8300_clk_init(unsigned long hz)
+{
+	master_clk.rate = hz;
+	clkdev_add_table(lookups, ARRAY_SIZE(lookups));
+	return 0;
+}
diff --git a/arch/h8300/kernel/h8300_ksyms.c b/arch/h8300/kernel/h8300_ksyms.c
new file mode 100644
index 0000000..64fbf32
--- /dev/null
+++ b/arch/h8300/kernel/h8300_ksyms.c
@@ -0,0 +1,64 @@
+#include <linux/module.h>
+#include <linux/linkage.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/user.h>
+#include <linux/elfcore.h>
+#include <linux/in6.h>
+#include <linux/interrupt.h>
+
+#include <asm/setup.h>
+#include <asm/pgalloc.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/checksum.h>
+#include <asm/current.h>
+
+asmlinkage long long __ashrdi3 (long long, int);
+asmlinkage long long __lshrdi3 (long long, int);
+extern char h8300_debug_device[];
+
+/*
+ * libgcc functions - functions that are used internally by the
+ * compiler...  (prototypes are not correct though, but that
+ * doesn't really matter since they're not versioned).
+ */
+extern void __gcc_bcmp(void);
+extern void __ashldi3(void);
+extern void __ashrdi3(void);
+extern void __cmpdi2(void);
+extern void __divdi3(void);
+extern void __divsi3(void);
+extern void __lshrdi3(void);
+extern void __moddi3(void);
+extern void __modsi3(void);
+extern void __muldi3(void);
+extern void __mulsi3(void);
+extern void __negdi2(void);
+extern void __ucmpdi2(void);
+extern void __udivdi3(void);
+extern void __udivmoddi4(void);
+extern void __udivsi3(void);
+extern void __umoddi3(void);
+extern void __umodsi3(void);
+
+	/* gcc lib functions */
+EXPORT_SYMBOL(__gcc_bcmp);
+EXPORT_SYMBOL(__ashldi3);
+EXPORT_SYMBOL(__ashrdi3);
+EXPORT_SYMBOL(__cmpdi2);
+EXPORT_SYMBOL(__divdi3);
+EXPORT_SYMBOL(__divsi3);
+EXPORT_SYMBOL(__lshrdi3);
+EXPORT_SYMBOL(__moddi3);
+EXPORT_SYMBOL(__modsi3);
+EXPORT_SYMBOL(__muldi3);
+EXPORT_SYMBOL(__mulsi3);
+EXPORT_SYMBOL(__negdi2);
+EXPORT_SYMBOL(__ucmpdi2);
+EXPORT_SYMBOL(__udivdi3);
+EXPORT_SYMBOL(__udivmoddi4);
+EXPORT_SYMBOL(__udivsi3);
+EXPORT_SYMBOL(__umoddi3);
+EXPORT_SYMBOL(__umodsi3);
diff --git a/arch/h8300/kernel/module.c b/arch/h8300/kernel/module.c
new file mode 100644
index 0000000..352aede
--- /dev/null
+++ b/arch/h8300/kernel/module.c
@@ -0,0 +1,75 @@
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(fmt...)
+#endif
+
+int apply_relocate_add(Elf32_Shdr *sechdrs,
+		       const char *strtab,
+		       unsigned int symindex,
+		       unsigned int relsec,
+		       struct module *me)
+{
+	unsigned int i;
+	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
+
+	DEBUGP("Applying relocate section %u to %u\n", relsec,
+	       sechdrs[relsec].sh_info);
+	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
+		/* This is where to make the change */
+		uint32_t *loc = (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr
+					     + rela[i].r_offset);
+		/* This is the symbol it is referring to.  Note that all
+		   undefined symbols have been resolved.  */
+		Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+			+ ELF32_R_SYM(rela[i].r_info);
+		uint32_t v = sym->st_value + rela[i].r_addend;
+
+		switch (ELF32_R_TYPE(rela[i].r_info)) {
+		case R_H8_DIR24R8:
+			loc = (uint32_t *)((uint32_t)loc - 1);
+			*loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
+			break;
+		case R_H8_DIR24A8:
+			if (ELF32_R_SYM(rela[i].r_info))
+				*loc += v;
+			break;
+		case R_H8_DIR32:
+		case R_H8_DIR32A16:
+			*loc += v;
+			break;
+		case R_H8_PCREL16:
+			v -= (unsigned long)loc + 2;
+			if ((Elf32_Sword)v > 0x7fff ||
+			    (Elf32_Sword)v < -(Elf32_Sword)0x8000)
+				goto overflow;
+			else
+				*(unsigned short *)loc = v;
+			break;
+		case R_H8_PCREL8:
+			v -= (unsigned long)loc + 1;
+			if ((Elf32_Sword)v > 0x7f ||
+			    (Elf32_Sword)v < -(Elf32_Sword)0x80)
+				goto overflow;
+			else
+				*(unsigned char *)loc = v;
+			break;
+		default:
+			printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+			       me->name, ELF32_R_TYPE(rela[i].r_info));
+			return -ENOEXEC;
+		}
+	}
+	return 0;
+ overflow:
+	printk(KERN_ERR "module %s: relocation offset overflow: %08x\n",
+	       me->name, rela[i].r_offset);
+	return -ENOEXEC;
+}
diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c
new file mode 100644
index 0000000..5241f29
--- /dev/null
+++ b/arch/h8300/kernel/process.c
@@ -0,0 +1,154 @@
+/*
+ *  linux/arch/h8300/kernel/process.c
+ *
+ * Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ *  Based on:
+ *
+ *  linux/arch/m68knommu/kernel/process.c
+ *
+ *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
+ *                      Kenneth Albanowski <kjahds@kjahds.com>,
+ *                      The Silver Hammer Group, Ltd.
+ *
+ *  linux/arch/m68k/kernel/process.c
+ *
+ *  Copyright (C) 1995  Hamish Macdonald
+ *
+ *  68060 fixes by Jesper Skov
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/rcupdate.h>
+
+#include <asm/uaccess.h>
+#include <asm/traps.h>
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+
+void (*pm_power_off)(void) = NULL;
+EXPORT_SYMBOL(pm_power_off);
+
+asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
+
+/*
+ * The idle loop on an H8/300..
+ */
+void arch_cpu_idle(void)
+{
+	local_irq_enable();
+	__asm__("sleep");
+}
+
+void machine_restart(char *__unused)
+{
+	local_irq_disable();
+	__asm__("jmp @@0");
+}
+
+void machine_halt(void)
+{
+	local_irq_disable();
+	__asm__("sleep");
+	for (;;)
+		;
+}
+
+void machine_power_off(void)
+{
+	local_irq_disable();
+	__asm__("sleep");
+	for (;;)
+		;
+}
+
+void show_regs(struct pt_regs *regs)
+{
+	show_regs_print_info(KERN_DEFAULT);
+
+	printk("\nPC: %08lx  Status: %02x",
+	       regs->pc, regs->ccr);
+	printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
+	       regs->orig_er0, regs->er0, regs->er1);
+	printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
+	       regs->er2, regs->er3, regs->er4, regs->er5);
+	printk("\nER6' %08lx ", regs->er6);
+	if (user_mode(regs))
+		printk("USP: %08lx\n", rdusp());
+	else
+		printk("\n");
+}
+
+void flush_thread(void)
+{
+}
+
+int copy_thread(unsigned long clone_flags,
+		unsigned long usp, unsigned long topstk,
+		struct task_struct *p)
+{
+	struct pt_regs *childregs;
+
+	childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
+
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		childregs->retpc = (unsigned long) ret_from_kernel_thread;
+		childregs->er4 = topstk; /* arg */
+		childregs->er5 = usp; /* fn */
+	}  else {
+		*childregs = *current_pt_regs();
+		childregs->er0 = 0;
+		childregs->retpc = (unsigned long) ret_from_fork;
+		p->thread.usp = usp ?: rdusp();
+	}
+	p->thread.ksp = (unsigned long)childregs;
+
+	return 0;
+}
+
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+	return ((struct pt_regs *)tsk->thread.esp0)->pc;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long fp, pc;
+	unsigned long stack_page;
+	int count = 0;
+
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	stack_page = (unsigned long)p;
+	fp = ((struct pt_regs *)p->thread.ksp)->er6;
+	do {
+		if (fp < stack_page+sizeof(struct thread_info) ||
+		    fp >= 8184+stack_page)
+			return 0;
+		pc = ((unsigned long *)fp)[1];
+		if (!in_sched_functions(pc))
+			return pc;
+		fp = *(unsigned long *) fp;
+	} while (count++ < 16);
+	return 0;
+}
diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c
new file mode 100644
index 0000000..b26be06
--- /dev/null
+++ b/arch/h8300/kernel/setup.c
@@ -0,0 +1,172 @@
+/*
+ *  linux/arch/h8300/kernel/setup.c
+ *
+ *  Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp>
+ */
+
+/*
+ * This file handles the architecture-dependent parts of system setup
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/console.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <asm/bootparams.h>
+
+#if defined(CONFIG_CPU_H8300H)
+#define CPU "H8/300H"
+#elif defined(CONFIG_CPU_H8S)
+#define CPU "H8S"
+#else
+#define CPU "Unknown"
+#endif
+
+struct bootparams bootparams;
+unsigned long rom_length;
+unsigned long memory_start;
+unsigned long memory_end;
+
+char __initdata command_line[COMMAND_LINE_SIZE];
+
+extern unsigned long _ramend;
+void sim_console_register(void);
+int h8300_clk_init(unsigned long hz);
+
+void __init __attribute__((weak)) early_device_init(void)
+{
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+	int bootmap_size;
+
+#if defined(CONFIG_ROMKERNEL)
+	bootparams.ram_end = CONFIG_RAMBASE + CONFIG_RAMSIZE;
+	bootparams.clock_freq = CONFIG_CPU_CLOCK;
+#endif
+
+	memory_start = (unsigned long) &_ramend;
+
+	memory_start = PAGE_ALIGN(memory_start);
+	memory_end = bootparams.ram_end;
+
+	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) 0;
+
+	pr_notice("\r\n\nuClinux " CPU "\n");
+	pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
+
+	strcpy(boot_command_line, command_line);
+	*cmdline_p = command_line;
+
+	parse_early_param();
+
+	/*
+	 * give all the memory to the bootmap allocator,  tell it to put the
+	 * boot mem_map at the start of memory
+	 */
+	bootmap_size = init_bootmem_node(
+			NODE_DATA(0),
+			memory_start >> PAGE_SHIFT, /* map goes here */
+			PAGE_OFFSET >> PAGE_SHIFT,	/* 0 on coldfire */
+			memory_end >> PAGE_SHIFT);
+	/*
+	 * free the usable memory,  we have to make sure we do not free
+	 * the bootmem bitmap so we then reserve it after freeing it :-)
+	 */
+	free_bootmem(memory_start, memory_end - memory_start);
+	reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
+
+	h8300_clk_init(bootparams.clock_freq);
+	early_device_init();
+#if defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)
+	sim_console_register();
+#endif
+	early_platform_driver_probe("earlyprintk", 1, 0);
+	/*
+	 * get kmalloc into gear
+	 */
+	paging_init();
+}
+
+/*
+ *	Get CPU information for use by the procfs.
+ */
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+	char *cpu;
+	u_long clockfreq;
+
+	cpu = CPU;
+	clockfreq = bootparams.clock_freq;
+
+	seq_printf(m,  "CPU:\t\t%s\n"
+		   "Clock:\t\t%lu.%1luMHz\n"
+		   "BogoMips:\t%lu.%02lu\n"
+		   "Calibration:\t%lu loops\n",
+		   cpu,
+		   clockfreq/1000, clockfreq%1000,
+		   (loops_per_jiffy*HZ)/500000,
+		   ((loops_per_jiffy*HZ)/5000)%100,
+		   (loops_per_jiffy*HZ));
+
+	return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+	return *pos < num_possible_cpus() ?
+		((void *) 0x12345678) : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	++*pos;
+	return c_start(m, pos);
+}
+
+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	= show_cpuinfo,
+};
+
+void __init parse_bootparam(struct bootparams *bp)
+{
+	memcpy(&bootparams, bp, bp->size);
+	strncpy(command_line, bootparams.command_line, sizeof(command_line));
+}
+
+static void __init timer_setup(void)
+{
+	early_platform_driver_register_all("earlytimer");
+	early_platform_driver_probe("earlytimer", 1, 0);
+}
+
+void __init time_init(void)
+{
+	late_time_init = timer_setup;
+}
diff --git a/arch/h8300/kernel/sim-console.c b/arch/h8300/kernel/sim-console.c
new file mode 100644
index 0000000..a15edf0
--- /dev/null
+++ b/arch/h8300/kernel/sim-console.c
@@ -0,0 +1,79 @@
+/*
+ * arch/h8300/kernel/early_printk.c
+ *
+ *  Copyright (C) 2009 Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+static void sim_write(struct console *co, const char *ptr,
+				 unsigned len)
+{
+	register const int fd __asm__("er0") = 1; /* stdout */
+	register const char *_ptr __asm__("er1") = ptr;
+	register const unsigned _len __asm__("er2") = len;
+
+	__asm__(".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */
+		: : "g"(fd), "g"(_ptr), "g"(_len));
+}
+
+static struct console sim_console = {
+	.name		= "sim_console",
+	.write		= sim_write,
+	.setup		= NULL,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+};
+
+static char sim_console_buf[32];
+
+static int sim_probe(struct platform_device *pdev)
+{
+	if (sim_console.data)
+		return -EEXIST;
+
+	if (!strstr(sim_console_buf, "keep"))
+		sim_console.flags |= CON_BOOT;
+
+	register_console(&sim_console);
+	return 0;
+}
+
+static int sim_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver sim_driver = {
+	.probe		= sim_probe,
+	.remove		= sim_remove,
+	.driver		= {
+		.name	= "h8300-sim",
+		.owner	= THIS_MODULE,
+	},
+};
+
+early_platform_init_buffer("earlyprintk", &sim_driver,
+			   sim_console_buf, ARRAY_SIZE(sim_console_buf));
+
+static struct platform_device sim_console_device = {
+	.name		= "h8300-sim",
+	.id		= 0,
+};
+
+static struct platform_device *devices[] __initdata = {
+	&sim_console_device,
+};
+
+void __init sim_console_register(void)
+{
+	early_platform_add_devices(devices,
+				   ARRAY_SIZE(devices));
+}
diff --git a/arch/h8300/kernel/sys_h8300.c b/arch/h8300/kernel/sys_h8300.c
new file mode 100644
index 0000000..aa2302c
--- /dev/null
+++ b/arch/h8300/kernel/sys_h8300.c
@@ -0,0 +1,22 @@
+/*
+ * linux/arch/h8300/kernel/sys_h8300.c
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the H8/300
+ * platform.
+ */
+
+#include <asm/setup.h>
+#include <asm/uaccess.h>
+
+/* sys_cacheflush -- no support.  */
+asmlinkage int
+sys_cacheflush(unsigned long addr, int scope, int cache, unsigned long len)
+{
+	return -EINVAL;
+}
+
+asmlinkage int sys_getpagesize(void)
+{
+	return PAGE_SIZE;
+}
diff --git a/arch/h8300/kernel/vmlinux.lds.S b/arch/h8300/kernel/vmlinux.lds.S
new file mode 100644
index 0000000..e1b49aa
--- /dev/null
+++ b/arch/h8300/kernel/vmlinux.lds.S
@@ -0,0 +1,85 @@
+#include <asm-generic/vmlinux.lds.h>
+#include <asm/page.h>
+
+#define ROMTOP 0x000000
+#define RAMTOP CONFIG_RAMBASE
+
+jiffies = jiffies_64 + 4;
+
+ENTRY(_start)
+
+SECTIONS
+{
+#if defined(CONFIG_ROMKERNEL)
+	. = ROMTOP;
+	.vectors :
+	{
+	_vector = . ;
+		*(.vector*)
+	}
+#else
+	. = RAMTOP;
+	_ramstart = .;
+	. = . + CONFIG_OFFSET;
+#endif
+	_text = .;
+	HEAD_TEXT_SECTION
+	.text : {
+	_stext = . ;
+		TEXT_TEXT
+		SCHED_TEXT
+		LOCK_TEXT
+#if defined(CONFIG_ROMKERNEL)
+		*(.int_redirect)
+#endif
+	_etext = . ;
+	}
+	EXCEPTION_TABLE(16)
+	NOTES
+	RO_DATA(4)
+#if defined(CONFIG_ROMKERNEL)
+	.init.text : {
+		_sinittext = .;
+		INIT_TEXT
+		_einittext = .;
+	}
+	SECURITY_INIT
+#endif
+	ROMEND = .;
+#if defined(CONFIG_ROMKERNEL)
+	. = RAMTOP;
+	_ramstart = .;
+	.data :	AT(ROMEND)
+#else
+	.data :
+#endif
+	{
+	_sdata = . ;
+	__data_start = . ;
+		INIT_TASK_DATA(0x2000)
+		NOSAVE_DATA
+		PAGE_ALIGNED_DATA(0x1000)
+		CACHELINE_ALIGNED_DATA(0x0002)
+		READ_MOSTLY_DATA(0x0002)
+		DATA_DATA
+		CONSTRUCTORS
+	}
+	. = ALIGN(0x4) ;
+	__init_begin = .;
+#if defined(CONFIG_RAMKERNEL)
+	INIT_TEXT_SECTION(4)
+#endif
+	INIT_DATA_SECTION(4)
+#if defined(CONFIG_RAMKERNEL)
+	SECURITY_INIT
+#endif
+	__init_end = .;
+	_edata = . ;
+	_begin_data = LOADADDR(.data);
+	_sbss =.;
+	BSS_SECTION(4,4,4)
+	_ebss =.;
+	_ramend = .;
+	_end = .;
+	DISCARDS
+}
-- 
2.1.3