1 files changed, 370 insertions, 0 deletions
diff --git a/arch/parisc/boot/compressed/misc.c b/arch/parisc/boot/compressed/misc.c
new file mode 100644
index 0000000000..d389359e22
--- /dev/null
+++ b/arch/parisc/boot/compressed/misc.c
@@ -0,0 +1,370 @@
+/*
+ * Definitions and wrapper functions for kernel decompressor
+ *
+ *   (C) 2017 Helge Deller <deller@gmx.de>
+ */
+
+#include <linux/uaccess.h>
+#include <linux/elf.h>
+#include <asm/unaligned.h>
+#include <asm/page.h>
+#include "sizes.h"
+
+/*
+ * gzip declarations
+ */
+#define STATIC static
+
+#undef memmove
+#define memmove memmove
+#define memzero(s, n) memset((s), 0, (n))
+
+#define malloc	malloc_gzip
+#define free	free_gzip
+
+/* Symbols defined by linker scripts */
+extern char input_data[];
+extern int input_len;
+/* output_len is inserted by the linker possibly at an unaligned address */
+extern char output_len;
+extern char _text, _end;
+extern char _bss, _ebss;
+extern char _startcode_end;
+extern void startup_continue(void *entry, unsigned long cmdline,
+	unsigned long rd_start, unsigned long rd_end) __noreturn;
+
+void error(char *m) __noreturn;
+
+static unsigned long free_mem_ptr;
+static unsigned long free_mem_end_ptr;
+
+#ifdef CONFIG_KERNEL_GZIP
+#include "../../../../lib/decompress_inflate.c"
+#endif
+
+#ifdef CONFIG_KERNEL_BZIP2
+#include "../../../../lib/decompress_bunzip2.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZ4
+#include "../../../../lib/decompress_unlz4.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZMA
+#include "../../../../lib/decompress_unlzma.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZO
+#include "../../../../lib/decompress_unlzo.c"
+#endif
+
+#ifdef CONFIG_KERNEL_XZ
+#include "../../../../lib/decompress_unxz.c"
+#endif
+
+void *memmove(void *dest, const void *src, size_t n)
+{
+	const char *s = src;
+	char *d = dest;
+
+	if (d <= s) {
+		while (n--)
+			*d++ = *s++;
+	} else {
+		d += n;
+		s += n;
+		while (n--)
+			*--d = *--s;
+	}
+	return dest;
+}
+
+void *memset(void *s, int c, size_t count)
+{
+	char *xs = (char *)s;
+
+	while (count--)
+		*xs++ = c;
+	return s;
+}
+
+void *memcpy(void *d, const void *s, size_t len)
+{
+	char *dest = (char *)d;
+	const char *source = (const char *)s;
+
+	while (len--)
+		*dest++ = *source++;
+	return d;
+}
+
+size_t strlen(const char *s)
+{
+	const char *sc;
+
+	for (sc = s; *sc != '\0'; ++sc)
+		;
+	return sc - s;
+}
+
+char *strchr(const char *s, int c)
+{
+	while (*s) {
+		if (*s == (char)c)
+			return (char *)s;
+		++s;
+	}
+	return NULL;
+}
+
+static int puts(const char *s)
+{
+	const char *nuline = s;
+
+	while ((nuline = strchr(s, '\n')) != NULL) {
+		if (nuline != s)
+			pdc_iodc_print(s, nuline - s);
+		pdc_iodc_print("\r\n", 2);
+		s = nuline + 1;
+	}
+	if (*s != '\0')
+		pdc_iodc_print(s, strlen(s));
+
+	return 0;
+}
+
+static int putchar(int c)
+{
+	char buf[2];
+
+	buf[0] = c;
+	buf[1] = '\0';
+	puts(buf);
+	return c;
+}
+
+void __noreturn error(char *x)
+{
+	if (x) puts(x);
+	puts("\n -- System halted\n");
+	while (1)	/* wait forever */
+		;
+}
+
+static int print_num(unsigned long num, int base)
+{
+	const char hex[] = "0123456789abcdef";
+	char str[40];
+	int i = sizeof(str)-1;
+
+	str[i--] = '\0';
+	do {
+		str[i--] = hex[num % base];
+		num = num / base;
+	} while (num);
+
+	if (base == 16) {
+		str[i--] = 'x';
+		str[i] = '0';
+	} else i++;
+	puts(&str[i]);
+
+	return 0;
+}
+
+static int printf(const char *fmt, ...)
+{
+	va_list args;
+	int i = 0;
+
+	va_start(args, fmt);
+
+	while (fmt[i]) {
+		if (fmt[i] != '%') {
+put:
+			putchar(fmt[i++]);
+			continue;
+		}
+
+		if (fmt[++i] == '%')
+			goto put;
+		print_num(va_arg(args, unsigned long),
+			fmt[i] == 'x' ? 16:10);
+		++i;
+	}
+
+	va_end(args);
+	return 0;
+}
+
+/* helper functions for libgcc */
+void abort(void)
+{
+	error("aborted.");
+}
+
+#undef malloc
+static void *malloc(size_t size)
+{
+	return malloc_gzip(size);
+}
+
+#undef free
+static void free(void *ptr)
+{
+	return free_gzip(ptr);
+}
+
+
+static void flush_data_cache(char *start, unsigned long length)
+{
+	char *end = start + length;
+
+	do {
+		asm volatile("fdc 0(%0)" : : "r" (start));
+		asm volatile("fic 0(%%sr0,%0)" : : "r" (start));
+		start += 16;
+	} while (start < end);
+	asm volatile("fdc 0(%0)" : : "r" (end));
+
+	asm ("sync");
+}
+
+static void parse_elf(void *output)
+{
+#ifdef CONFIG_64BIT
+	Elf64_Ehdr ehdr;
+	Elf64_Phdr *phdrs, *phdr;
+#else
+	Elf32_Ehdr ehdr;
+	Elf32_Phdr *phdrs, *phdr;
+#endif
+	void *dest;
+	int i;
+
+	memcpy(&ehdr, output, sizeof(ehdr));
+	if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
+	   ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
+	   ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
+	   ehdr.e_ident[EI_MAG3] != ELFMAG3) {
+		error("Kernel is not a valid ELF file");
+		return;
+	}
+
+#ifdef DEBUG
+	printf("Parsing ELF... ");
+#endif
+
+	phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
+	if (!phdrs)
+		error("Failed to allocate space for phdrs");
+
+	memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
+
+	for (i = 0; i < ehdr.e_phnum; i++) {
+		phdr = &phdrs[i];
+
+		switch (phdr->p_type) {
+		case PT_LOAD:
+			dest = (void *)((unsigned long) phdr->p_paddr &
+					(__PAGE_OFFSET_DEFAULT-1));
+			memmove(dest, output + phdr->p_offset, phdr->p_filesz);
+			break;
+		default:
+			break;
+		}
+	}
+
+	free(phdrs);
+}
+
+asmlinkage unsigned long __visible decompress_kernel(unsigned int started_wide,
+		unsigned int command_line,
+		const unsigned int rd_start,
+		const unsigned int rd_end)
+{
+	char *output;
+	unsigned long vmlinux_addr, vmlinux_len;
+	unsigned long kernel_addr, kernel_len;
+
+#ifdef CONFIG_64BIT
+	parisc_narrow_firmware = 0;
+#endif
+
+	set_firmware_width_unlocked();
+
+	putchar('D');	/* if you get this D and no more, string storage */
+			/* in $GLOBAL$ is wrong or %dp is wrong */
+	puts("ecompressing Linux... ");
+
+	/* where the final bits are stored */
+	kernel_addr = KERNEL_BINARY_TEXT_START;
+	kernel_len = __pa(SZ_end) - __pa(SZparisc_kernel_start);
+	if ((unsigned long) &_startcode_end > kernel_addr)
+		error("Bootcode overlaps kernel code");
+
+	/*
+	 * Calculate addr to where the vmlinux ELF file shall be decompressed.
+	 * Assembly code in head.S positioned the stack directly behind bss, so
+	 * leave 2 MB for the stack.
+	 */
+	vmlinux_addr = (unsigned long) &_ebss + 2*1024*1024;
+	vmlinux_len = get_unaligned_le32(&output_len);
+	output = (char *) vmlinux_addr;
+
+	/*
+	 * Initialize free_mem_ptr and free_mem_end_ptr.
+	 */
+	free_mem_ptr = vmlinux_addr + vmlinux_len;
+
+	/* Limit memory for bootoader to 1GB */
+	#define ARTIFICIAL_LIMIT (1*1024*1024*1024)
+	free_mem_end_ptr = PAGE0->imm_max_mem;
+	if (free_mem_end_ptr > ARTIFICIAL_LIMIT)
+		free_mem_end_ptr = ARTIFICIAL_LIMIT;
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	/* if we have ramdisk this is at end of memory */
+	if (rd_start && rd_start < free_mem_end_ptr)
+		free_mem_end_ptr = rd_start;
+#endif
+
+	if (free_mem_ptr >= free_mem_end_ptr) {
+		int free_ram;
+		free_ram = (free_mem_ptr >> 20) + 1;
+		if (free_ram < 32)
+			free_ram = 32;
+		printf("\nKernel requires at least %d MB RAM.\n",
+			free_ram);
+		error(NULL);
+	}
+
+#ifdef DEBUG
+	printf("\n");
+	printf("startcode_end = %x\n", &_startcode_end);
+	printf("commandline   = %x\n", command_line);
+	printf("rd_start      = %x\n", rd_start);
+	printf("rd_end        = %x\n", rd_end);
+
+	printf("free_ptr      = %x\n", free_mem_ptr);
+	printf("free_ptr_end  = %x\n", free_mem_end_ptr);
+
+	printf("input_data    = %x\n", input_data);
+	printf("input_len     = %x\n", input_len);
+	printf("output        = %x\n", output);
+	printf("output_len    = %x\n", vmlinux_len);
+	printf("kernel_addr   = %x\n", kernel_addr);
+	printf("kernel_len    = %x\n", kernel_len);
+#endif
+
+	__decompress(input_data, input_len, NULL, NULL,
+			output, 0, NULL, error);
+	parse_elf(output);
+
+	output = (char *) kernel_addr;
+	flush_data_cache(output, kernel_len);
+
+	printf("done.\nBooting the kernel.\n");
+
+	return (unsigned long) output;
+}