Orange Pi5 kernel

 // SPDX-License-Identifier: GPL-2.0
/*
 * misc.c
 *
 * This is a collection of several routines used to extract the kernel
 * which includes KASLR relocation, decompression, ELF parsing, and
 * relocation processing. Additionally included are the screen and serial
 * output functions and related debugging support functions.
 *
 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
 */
 
#include "misc.h"
#include "error.h"
#include "pgtable.h"
#include "../string.h"
#include "../voffset.h"
#include <asm/bootparam_utils.h>
 
/*
 * WARNING!!
 * This code is compiled with -fPIC and it is relocated dynamically at
 * run time, but no relocation processing is performed. This means that
 * it is not safe to place pointers in static structures.
 */
 
/* Macros used by the included decompressor code below. */
#define STATIC		static
 
/*
 * Provide definitions of memzero and memmove as some of the decompressors will
 * try to define their own functions if these are not defined as macros.
 */
#define memzero(s, n)	memset((s), 0, (n))
#define memmove		memmove
 
/* Functions used by the included decompressor code below. */
void *memmove(void *dest, const void *src, size_t n);
 
/*
 * This is set up by the setup-routine at boot-time
 */
struct boot_params *boot_params;
 
memptr free_mem_ptr;
memptr free_mem_end_ptr;
 
static char *vidmem;
static int vidport;
static int lines, cols;
 
#ifdef CONFIG_KERNEL_GZIP
#include "../../../../lib/decompress_inflate.c"
#endif
 
#ifdef CONFIG_KERNEL_BZIP2
#include "../../../../lib/decompress_bunzip2.c"
#endif
 
#ifdef CONFIG_KERNEL_LZMA
#include "../../../../lib/decompress_unlzma.c"
#endif
 
#ifdef CONFIG_KERNEL_XZ
#include "../../../../lib/decompress_unxz.c"
#endif
 
#ifdef CONFIG_KERNEL_LZO
#include "../../../../lib/decompress_unlzo.c"
#endif
 
#ifdef CONFIG_KERNEL_LZ4
#include "../../../../lib/decompress_unlz4.c"
#endif
 
#ifdef CONFIG_KERNEL_ZSTD
#include "../../../../lib/decompress_unzstd.c"
#endif
/*
 * NOTE: When adding a new decompressor, please update the analysis in
 * ../header.S.
 */
 
static void scroll(void)
{
<------>int i;
 
<------>memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
<------>for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
<------><------>vidmem[i] = ' ';
}
 
#define XMTRDY          0x20
 
#define TXR             0       /*  Transmit register (WRITE) */
#define LSR             5       /*  Line Status               */
static void serial_putchar(int ch)
{
<------>unsigned timeout = 0xffff;
 
<------>while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
<------><------>cpu_relax();
 
<------>outb(ch, early_serial_base + TXR);
}
 
void __putstr(const char *s)
{
<------>int x, y, pos;
<------>char c;
 
<------>if (early_serial_base) {
<------><------>const char *str = s;
<------><------>while (*str) {
<------><------><------>if (*str == '\n')
<------><------><------><------>serial_putchar('\r');
<------><------><------>serial_putchar(*str++);
<------><------>}
<------>}
 
<------>if (lines == 0 || cols == 0)
<------><------>return;
 
<------>x = boot_params->screen_info.orig_x;
<------>y = boot_params->screen_info.orig_y;
 
<------>while ((c = *s++) != '\0') {
<------><------>if (c == '\n') {
<------><------><------>x = 0;
<------><------><------>if (++y >= lines) {
<------><------><------><------>scroll();
<------><------><------><------>y--;
<------><------><------>}
<------><------>} else {
<------><------><------>vidmem[(x + cols * y) * 2] = c;
<------><------><------>if (++x >= cols) {
<------><------><------><------>x = 0;
<------><------><------><------>if (++y >= lines) {
<------><------><------><------><------>scroll();
<------><------><------><------><------>y--;
<------><------><------><------>}
<------><------><------>}
<------><------>}
<------>}
 
<------>boot_params->screen_info.orig_x = x;
<------>boot_params->screen_info.orig_y = y;
 
<------>pos = (x + cols * y) * 2;	/* Update cursor position */
<------>outb(14, vidport);
<------>outb(0xff & (pos >> 9), vidport+1);
<------>outb(15, vidport);
<------>outb(0xff & (pos >> 1), vidport+1);
}
 
void __puthex(unsigned long value)
{
<------>char alpha[2] = "0";
<------>int bits;
 
<------>for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
<------><------>unsigned long digit = (value >> bits) & 0xf;
 
<------><------>if (digit < 0xA)
<------><------><------>alpha[0] = '0' + digit;
<------><------>else
<------><------><------>alpha[0] = 'a' + (digit - 0xA);
 
<------><------>__putstr(alpha);
<------>}
}
 
#if CONFIG_X86_NEED_RELOCS
static void handle_relocations(void *output, unsigned long output_len,
<------><------><------>       unsigned long virt_addr)
{
<------>int *reloc;
<------>unsigned long delta, map, ptr;
<------>unsigned long min_addr = (unsigned long)output;
<------>unsigned long max_addr = min_addr + (VO___bss_start - VO__text);
 
<------>/*
<------> * Calculate the delta between where vmlinux was linked to load
<------> * and where it was actually loaded.
<------> */
<------>delta = min_addr - LOAD_PHYSICAL_ADDR;
 
<------>/*
<------> * The kernel contains a table of relocation addresses. Those
<------> * addresses have the final load address of the kernel in virtual
<------> * memory. We are currently working in the self map. So we need to
<------> * create an adjustment for kernel memory addresses to the self map.
<------> * This will involve subtracting out the base address of the kernel.
<------> */
<------>map = delta - __START_KERNEL_map;
 
<------>/*
<------> * 32-bit always performs relocations. 64-bit relocations are only
<------> * needed if KASLR has chosen a different starting address offset
<------> * from __START_KERNEL_map.
<------> */
<------>if (IS_ENABLED(CONFIG_X86_64))
<------><------>delta = virt_addr - LOAD_PHYSICAL_ADDR;
 
<------>if (!delta) {
<------><------>debug_putstr("No relocation needed... ");
<------><------>return;
<------>}
<------>debug_putstr("Performing relocations... ");
 
<------>/*
<------> * Process relocations: 32 bit relocations first then 64 bit after.
<------> * Three sets of binary relocations are added to the end of the kernel
<------> * before compression. Each relocation table entry is the kernel
<------> * address of the location which needs to be updated stored as a
<------> * 32-bit value which is sign extended to 64 bits.
<------> *
<------> * Format is:
<------> *
<------> * kernel bits...
<------> * 0 - zero terminator for 64 bit relocations
<------> * 64 bit relocation repeated
<------> * 0 - zero terminator for inverse 32 bit relocations
<------> * 32 bit inverse relocation repeated
<------> * 0 - zero terminator for 32 bit relocations
<------> * 32 bit relocation repeated
<------> *
<------> * So we work backwards from the end of the decompressed image.
<------> */
<------>for (reloc = output + output_len - sizeof(*reloc); *reloc; reloc--) {
<------><------>long extended = *reloc;
<------><------>extended += map;
 
<------><------>ptr = (unsigned long)extended;
<------><------>if (ptr < min_addr || ptr > max_addr)
<------><------><------>error("32-bit relocation outside of kernel!\n");
 
<------><------>*(uint32_t *)ptr += delta;
<------>}
#ifdef CONFIG_X86_64
<------>while (*--reloc) {
<------><------>long extended = *reloc;
<------><------>extended += map;
 
<------><------>ptr = (unsigned long)extended;
<------><------>if (ptr < min_addr || ptr > max_addr)
<------><------><------>error("inverse 32-bit relocation outside of kernel!\n");
 
<------><------>*(int32_t *)ptr -= delta;
<------>}
<------>for (reloc--; *reloc; reloc--) {
<------><------>long extended = *reloc;
<------><------>extended += map;
 
<------><------>ptr = (unsigned long)extended;
<------><------>if (ptr < min_addr || ptr > max_addr)
<------><------><------>error("64-bit relocation outside of kernel!\n");
 
<------><------>*(uint64_t *)ptr += delta;
<------>}
#endif
}
#else
static inline void handle_relocations(void *output, unsigned long output_len,
<------><------><------><------>      unsigned long virt_addr)
{ }
#endif
 
static void parse_elf(void *output)
{
#ifdef CONFIG_X86_64
<------>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;
<------>}
 
<------>debug_putstr("Parsing ELF... ");
 
<------>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:
#ifdef CONFIG_X86_64
<------><------><------>if ((phdr->p_align % 0x200000) != 0)
<------><------><------><------>error("Alignment of LOAD segment isn't multiple of 2MB");
#endif
#ifdef CONFIG_RELOCATABLE
<------><------><------>dest = output;
<------><------><------>dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
#else
<------><------><------>dest = (void *)(phdr->p_paddr);
#endif
<------><------><------>memmove(dest, output + phdr->p_offset, phdr->p_filesz);
<------><------><------>break;
<------><------>default: /* Ignore other PT_* */ break;
<------><------>}
<------>}
 
<------>free(phdrs);
}
 
/*
 * The compressed kernel image (ZO), has been moved so that its position
 * is against the end of the buffer used to hold the uncompressed kernel
 * image (VO) and the execution environment (.bss, .brk), which makes sure
 * there is room to do the in-place decompression. (See header.S for the
 * calculations.)
 *
 *                             |-----compressed kernel image------|
 *                             V                                  V
 * 0                       extract_offset                      +INIT_SIZE
 * |-----------|---------------|-------------------------|--------|
 *             |               |                         |        |
 *           VO__text      startup_32 of ZO          VO__end    ZO__end
 *             ^                                         ^
 *             |-------uncompressed kernel image---------|
 *
 */
asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
<------><------><------><------>  unsigned char *input_data,
<------><------><------><------>  unsigned long input_len,
<------><------><------><------>  unsigned char *output,
<------><------><------><------>  unsigned long output_len)
{
<------>const unsigned long kernel_total_size = VO__end - VO__text;
<------>unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
<------>unsigned long needed_size;
 
<------>/* Retain x86 boot parameters pointer passed from startup_32/64. */
<------>boot_params = rmode;
 
<------>/* Clear flags intended for solely in-kernel use. */
<------>boot_params->hdr.loadflags &= ~KASLR_FLAG;
 
<------>sanitize_boot_params(boot_params);
 
<------>if (boot_params->screen_info.orig_video_mode == 7) {
<------><------>vidmem = (char *) 0xb0000;
<------><------>vidport = 0x3b4;
<------>} else {
<------><------>vidmem = (char *) 0xb8000;
<------><------>vidport = 0x3d4;
<------>}
 
<------>lines = boot_params->screen_info.orig_video_lines;
<------>cols = boot_params->screen_info.orig_video_cols;
 
<------>console_init();
 
<------>/*
<------> * Save RSDP address for later use. Have this after console_init()
<------> * so that early debugging output from the RSDP parsing code can be
<------> * collected.
<------> */
<------>boot_params->acpi_rsdp_addr = get_rsdp_addr();
 
<------>debug_putstr("early console in extract_kernel\n");
 
<------>free_mem_ptr     = heap;	/* Heap */
<------>free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
 
<------>/*
<------> * The memory hole needed for the kernel is the larger of either
<------> * the entire decompressed kernel plus relocation table, or the
<------> * entire decompressed kernel plus .bss and .brk sections.
<------> *
<------> * On X86_64, the memory is mapped with PMD pages. Round the
<------> * size up so that the full extent of PMD pages mapped is
<------> * included in the check against the valid memory table
<------> * entries. This ensures the full mapped area is usable RAM
<------> * and doesn't include any reserved areas.
<------> */
<------>needed_size = max(output_len, kernel_total_size);
#ifdef CONFIG_X86_64
<------>needed_size = ALIGN(needed_size, MIN_KERNEL_ALIGN);
#endif
 
<------>/* Report initial kernel position details. */
<------>debug_putaddr(input_data);
<------>debug_putaddr(input_len);
<------>debug_putaddr(output);
<------>debug_putaddr(output_len);
<------>debug_putaddr(kernel_total_size);
<------>debug_putaddr(needed_size);
 
#ifdef CONFIG_X86_64
<------>/* Report address of 32-bit trampoline */
<------>debug_putaddr(trampoline_32bit);
#endif
 
<------>choose_random_location((unsigned long)input_data, input_len,
<------><------><------><------>(unsigned long *)&output,
<------><------><------><------>needed_size,
<------><------><------><------>&virt_addr);
 
<------>/* Validate memory location choices. */
<------>if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
<------><------>error("Destination physical address inappropriately aligned");
<------>if (virt_addr & (MIN_KERNEL_ALIGN - 1))
<------><------>error("Destination virtual address inappropriately aligned");
#ifdef CONFIG_X86_64
<------>if (heap > 0x3fffffffffffUL)
<------><------>error("Destination address too large");
<------>if (virt_addr + max(output_len, kernel_total_size) > KERNEL_IMAGE_SIZE)
<------><------>error("Destination virtual address is beyond the kernel mapping area");
#else
<------>if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
<------><------>error("Destination address too large");
#endif
#ifndef CONFIG_RELOCATABLE
<------>if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
<------><------>error("Destination address does not match LOAD_PHYSICAL_ADDR");
<------>if (virt_addr != LOAD_PHYSICAL_ADDR)
<------><------>error("Destination virtual address changed when not relocatable");
#endif
 
<------>debug_putstr("\nDecompressing Linux... ");
<------>__decompress(input_data, input_len, NULL, NULL, output, output_len,
<------><------><------>NULL, error);
<------>parse_elf(output);
<------>handle_relocations(output, output_len, virt_addr);
<------>debug_putstr("done.\nBooting the kernel.\n");
 
<------>/*
<------> * Flush GHCB from cache and map it encrypted again when running as
<------> * SEV-ES guest.
<------> */
<------>sev_es_shutdown_ghcb();
 
<------>return output;
}
 
void fortify_panic(const char *name)
{
<------>error("detected buffer overflow");
}

	// SPDX-License-Identifier: GPL-2.0
	/*
	* misc.c
	*
	* This is a collection of several routines used to extract the kernel
	* which includes KASLR relocation, decompression, ELF parsing, and
	* relocation processing. Additionally included are the screen and serial
	* output functions and related debugging support functions.
	*
	* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
	* puts by Nick Holloway 1993, better puts by Martin Mares 1995
	* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
	*/

	#include "misc.h"
	#include "error.h"
	#include "pgtable.h"
	#include "../string.h"
	#include "../voffset.h"
	#include <asm/bootparam_utils.h>

	/*
	* WARNING!!
	* This code is compiled with -fPIC and it is relocated dynamically at
	* run time, but no relocation processing is performed. This means that
	* it is not safe to place pointers in static structures.
	*/

	/* Macros used by the included decompressor code below. */
	#define STATIC static

	/*
	* Provide definitions of memzero and memmove as some of the decompressors will
	* try to define their own functions if these are not defined as macros.
	*/
	#define memzero(s, n) memset((s), 0, (n))
	#define memmove memmove

	/* Functions used by the included decompressor code below. */
	void memmove(void dest, const void *src, size_t n);

	/*
	* This is set up by the setup-routine at boot-time
	*/
	struct boot_params *boot_params;

	memptr free_mem_ptr;
	memptr free_mem_end_ptr;

	static char *vidmem;
	static int vidport;
	static int lines, cols;

	#ifdef CONFIG_KERNEL_GZIP
	#include "../../../../lib/decompress_inflate.c"
	#endif

	#ifdef CONFIG_KERNEL_BZIP2
	#include "../../../../lib/decompress_bunzip2.c"
	#endif

	#ifdef CONFIG_KERNEL_LZMA
	#include "../../../../lib/decompress_unlzma.c"
	#endif

	#ifdef CONFIG_KERNEL_XZ
	#include "../../../../lib/decompress_unxz.c"
	#endif

	#ifdef CONFIG_KERNEL_LZO
	#include "../../../../lib/decompress_unlzo.c"
	#endif

	#ifdef CONFIG_KERNEL_LZ4
	#include "../../../../lib/decompress_unlz4.c"
	#endif

	#ifdef CONFIG_KERNEL_ZSTD
	#include "../../../../lib/decompress_unzstd.c"
	#endif
	/*
	* NOTE: When adding a new decompressor, please update the analysis in
	* ../header.S.
	*/

	static void scroll(void)
	{
	<------>int i;

	<------>memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
	<------>for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
	<------><------>vidmem[i] = ' ';
	}

	#define XMTRDY 0x20

	#define TXR 0 /* Transmit register (WRITE) */
	#define LSR 5 /* Line Status */
	static void serial_putchar(int ch)
	{
	<------>unsigned timeout = 0xffff;

	<------>while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
	<------><------>cpu_relax();

	<------>outb(ch, early_serial_base + TXR);
	}

	void __putstr(const char *s)
	{
	<------>int x, y, pos;
	<------>char c;

	<------>if (early_serial_base) {
	<------><------>const char *str = s;
	<------><------>while (*str) {
	<------><------><------>if (*str == '\n')
	<------><------><------><------>serial_putchar('\r');
	<------><------><------>serial_putchar(*str++);
	<------><------>}
	<------>}

	<------>if (lines == 0 \|\| cols == 0)
	<------><------>return;

	<------>x = boot_params->screen_info.orig_x;
	<------>y = boot_params->screen_info.orig_y;

	<------>while ((c = *s++) != '\0') {
	<------><------>if (c == '\n') {
	<------><------><------>x = 0;
	<------><------><------>if (++y >= lines) {
	<------><------><------><------>scroll();
	<------><------><------><------>y--;
	<------><------><------>}
	<------><------>} else {
	<------><------><------>vidmem[(x + cols * y) * 2] = c;
	<------><------><------>if (++x >= cols) {
	<------><------><------><------>x = 0;
	<------><------><------><------>if (++y >= lines) {
	<------><------><------><------><------>scroll();
	<------><------><------><------><------>y--;
	<------><------><------><------>}
	<------><------><------>}
	<------><------>}
	<------>}

	<------>boot_params->screen_info.orig_x = x;
	<------>boot_params->screen_info.orig_y = y;

	<------>pos = (x + cols * y) * 2; /* Update cursor position */
	<------>outb(14, vidport);
	<------>outb(0xff & (pos >> 9), vidport+1);
	<------>outb(15, vidport);
	<------>outb(0xff & (pos >> 1), vidport+1);
	}

	void __puthex(unsigned long value)
	{
	<------>char alpha[2] = "0";
	<------>int bits;

	<------>for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
	<------><------>unsigned long digit = (value >> bits) & 0xf;

	<------><------>if (digit < 0xA)
	<------><------><------>alpha[0] = '0' + digit;
	<------><------>else
	<------><------><------>alpha[0] = 'a' + (digit - 0xA);

	<------><------>__putstr(alpha);
	<------>}
	}

	#if CONFIG_X86_NEED_RELOCS
	static void handle_relocations(void *output, unsigned long output_len,
	<------><------><------> unsigned long virt_addr)
	{
	<------>int *reloc;
	<------>unsigned long delta, map, ptr;
	<------>unsigned long min_addr = (unsigned long)output;
	<------>unsigned long max_addr = min_addr + (VO___bss_start - VO__text);

	<------>/*
	<------> * Calculate the delta between where vmlinux was linked to load
	<------> * and where it was actually loaded.
	<------> */
	<------>delta = min_addr - LOAD_PHYSICAL_ADDR;

	<------>/*
	<------> * The kernel contains a table of relocation addresses. Those
	<------> * addresses have the final load address of the kernel in virtual
	<------> * memory. We are currently working in the self map. So we need to
	<------> * create an adjustment for kernel memory addresses to the self map.
	<------> * This will involve subtracting out the base address of the kernel.
	<------> */
	<------>map = delta - __START_KERNEL_map;

	<------>/*
	<------> * 32-bit always performs relocations. 64-bit relocations are only
	<------> * needed if KASLR has chosen a different starting address offset
	<------> * from __START_KERNEL_map.
	<------> */
	<------>if (IS_ENABLED(CONFIG_X86_64))
	<------><------>delta = virt_addr - LOAD_PHYSICAL_ADDR;

	<------>if (!delta) {
	<------><------>debug_putstr("No relocation needed... ");
	<------><------>return;
	<------>}
	<------>debug_putstr("Performing relocations... ");

	<------>/*
	<------> * Process relocations: 32 bit relocations first then 64 bit after.
	<------> * Three sets of binary relocations are added to the end of the kernel
	<------> * before compression. Each relocation table entry is the kernel
	<------> * address of the location which needs to be updated stored as a
	<------> * 32-bit value which is sign extended to 64 bits.
	<------> *
	<------> * Format is:
	<------> *
	<------> * kernel bits...
	<------> * 0 - zero terminator for 64 bit relocations
	<------> * 64 bit relocation repeated
	<------> * 0 - zero terminator for inverse 32 bit relocations
	<------> * 32 bit inverse relocation repeated
	<------> * 0 - zero terminator for 32 bit relocations
	<------> * 32 bit relocation repeated
	<------> *
	<------> * So we work backwards from the end of the decompressed image.
	<------> */
	<------>for (reloc = output + output_len - sizeof(reloc); reloc; reloc--) {
	<------><------>long extended = *reloc;
	<------><------>extended += map;

	<------><------>ptr = (unsigned long)extended;
	<------><------>if (ptr < min_addr \|\| ptr > max_addr)
	<------><------><------>error("32-bit relocation outside of kernel!\n");

	<------><------>(uint32_t )ptr += delta;
	<------>}
	#ifdef CONFIG_X86_64
	<------>while (*--reloc) {
	<------><------>long extended = *reloc;
	<------><------>extended += map;

	<------><------>ptr = (unsigned long)extended;
	<------><------>if (ptr < min_addr \|\| ptr > max_addr)
	<------><------><------>error("inverse 32-bit relocation outside of kernel!\n");

	<------><------>(int32_t )ptr -= delta;
	<------>}
	<------>for (reloc--; *reloc; reloc--) {
	<------><------>long extended = *reloc;
	<------><------>extended += map;

	<------><------>ptr = (unsigned long)extended;
	<------><------>if (ptr < min_addr \|\| ptr > max_addr)
	<------><------><------>error("64-bit relocation outside of kernel!\n");

	<------><------>(uint64_t )ptr += delta;
	<------>}
	#endif
	}
	#else
	static inline void handle_relocations(void *output, unsigned long output_len,
	<------><------><------><------> unsigned long virt_addr)
	{ }
	#endif

	static void parse_elf(void *output)
	{
	#ifdef CONFIG_X86_64
	<------>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;
	<------>}

	<------>debug_putstr("Parsing ELF... ");

	<------>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:
	#ifdef CONFIG_X86_64
	<------><------><------>if ((phdr->p_align % 0x200000) != 0)
	<------><------><------><------>error("Alignment of LOAD segment isn't multiple of 2MB");
	#endif
	#ifdef CONFIG_RELOCATABLE
	<------><------><------>dest = output;
	<------><------><------>dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
	#else
	<------><------><------>dest = (void *)(phdr->p_paddr);
	#endif
	<------><------><------>memmove(dest, output + phdr->p_offset, phdr->p_filesz);
	<------><------><------>break;
	<------><------>default: /* Ignore other PT_* */ break;
	<------><------>}
	<------>}

	<------>free(phdrs);
	}

	/*
	* The compressed kernel image (ZO), has been moved so that its position
	* is against the end of the buffer used to hold the uncompressed kernel
	* image (VO) and the execution environment (.bss, .brk), which makes sure
	* there is room to do the in-place decompression. (See header.S for the
	* calculations.)
	*
	* \|-----compressed kernel image------\|
	* V V
	* 0 extract_offset +INIT_SIZE
	* \|-----------\|---------------\|-------------------------\|--------\|
	* \| \| \| \|
	* VO__text startup_32 of ZO VO__end ZO__end
	* ^ ^
	* \|-------uncompressed kernel image---------\|
	*
	*/
	asmlinkage __visible void extract_kernel(void rmode, memptr heap,
	<------><------><------><------> unsigned char *input_data,
	<------><------><------><------> unsigned long input_len,
	<------><------><------><------> unsigned char *output,
	<------><------><------><------> unsigned long output_len)
	{
	<------>const unsigned long kernel_total_size = VO__end - VO__text;
	<------>unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
	<------>unsigned long needed_size;

	<------>/* Retain x86 boot parameters pointer passed from startup_32/64. */
	<------>boot_params = rmode;

	<------>/* Clear flags intended for solely in-kernel use. */
	<------>boot_params->hdr.loadflags &= ~KASLR_FLAG;

	<------>sanitize_boot_params(boot_params);

	<------>if (boot_params->screen_info.orig_video_mode == 7) {
	<------><------>vidmem = (char *) 0xb0000;
	<------><------>vidport = 0x3b4;
	<------>} else {
	<------><------>vidmem = (char *) 0xb8000;
	<------><------>vidport = 0x3d4;
	<------>}

	<------>lines = boot_params->screen_info.orig_video_lines;
	<------>cols = boot_params->screen_info.orig_video_cols;

	<------>console_init();

	<------>/*
	<------> * Save RSDP address for later use. Have this after console_init()
	<------> * so that early debugging output from the RSDP parsing code can be
	<------> * collected.
	<------> */
	<------>boot_params->acpi_rsdp_addr = get_rsdp_addr();

	<------>debug_putstr("early console in extract_kernel\n");

	<------>free_mem_ptr = heap; /* Heap */
	<------>free_mem_end_ptr = heap + BOOT_HEAP_SIZE;

	<------>/*
	<------> * The memory hole needed for the kernel is the larger of either
	<------> * the entire decompressed kernel plus relocation table, or the
	<------> * entire decompressed kernel plus .bss and .brk sections.
	<------> *
	<------> * On X86_64, the memory is mapped with PMD pages. Round the
	<------> * size up so that the full extent of PMD pages mapped is
	<------> * included in the check against the valid memory table
	<------> * entries. This ensures the full mapped area is usable RAM
	<------> * and doesn't include any reserved areas.
	<------> */
	<------>needed_size = max(output_len, kernel_total_size);
	#ifdef CONFIG_X86_64
	<------>needed_size = ALIGN(needed_size, MIN_KERNEL_ALIGN);
	#endif

	<------>/* Report initial kernel position details. */
	<------>debug_putaddr(input_data);
	<------>debug_putaddr(input_len);
	<------>debug_putaddr(output);
	<------>debug_putaddr(output_len);
	<------>debug_putaddr(kernel_total_size);
	<------>debug_putaddr(needed_size);

	#ifdef CONFIG_X86_64
	<------>/* Report address of 32-bit trampoline */
	<------>debug_putaddr(trampoline_32bit);
	#endif

	<------>choose_random_location((unsigned long)input_data, input_len,
	<------><------><------><------>(unsigned long *)&output,
	<------><------><------><------>needed_size,
	<------><------><------><------>&virt_addr);

	<------>/* Validate memory location choices. */
	<------>if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
	<------><------>error("Destination physical address inappropriately aligned");
	<------>if (virt_addr & (MIN_KERNEL_ALIGN - 1))
	<------><------>error("Destination virtual address inappropriately aligned");
	#ifdef CONFIG_X86_64
	<------>if (heap > 0x3fffffffffffUL)
	<------><------>error("Destination address too large");
	<------>if (virt_addr + max(output_len, kernel_total_size) > KERNEL_IMAGE_SIZE)
	<------><------>error("Destination virtual address is beyond the kernel mapping area");
	#else
	<------>if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
	<------><------>error("Destination address too large");
	#endif
	#ifndef CONFIG_RELOCATABLE
	<------>if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
	<------><------>error("Destination address does not match LOAD_PHYSICAL_ADDR");
	<------>if (virt_addr != LOAD_PHYSICAL_ADDR)
	<------><------>error("Destination virtual address changed when not relocatable");
	#endif

	<------>debug_putstr("\nDecompressing Linux... ");
	<------>__decompress(input_data, input_len, NULL, NULL, output, output_len,
	<------><------><------>NULL, error);
	<------>parse_elf(output);
	<------>handle_relocations(output, output_len, virt_addr);
	<------>debug_putstr("done.\nBooting the kernel.\n");

	<------>/*
	<------> * Flush GHCB from cache and map it encrypted again when running as
	<------> * SEV-ES guest.
	<------> */
	<------>sev_es_shutdown_ghcb();

	<------>return output;
	}

	void fortify_panic(const char *name)
	{
	<------>error("detected buffer overflow");
	}