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/*-
* Copyright (c) 2005 Olivier Houchard. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/arm/elf_trampoline.c 214648 2010-11-01 21:04:23Z cognet $");
#include <machine/asm.h>
#include <sys/param.h>
#include <sys/elf32.h>
#include <sys/inflate.h>
#include <machine/elf.h>
#include <machine/pte.h>
#include <machine/cpufunc.h>
#include <machine/armreg.h>
/*
* Since we are compiled outside of the normal kernel build process, we
* need to include opt_global.h manually.
*/
#include "opt_global.h"
#include "opt_kernname.h"
extern char kernel_start[];
extern char kernel_end[];
extern void *_end;
void _start(void);
void __start(void);
void __startC(void);
#define GZ_HEAD 0xa
#ifdef CPU_ARM7TDMI
#define cpu_idcache_wbinv_all arm7tdmi_cache_flushID
#elif defined(CPU_ARM8)
#define cpu_idcache_wbinv_all arm8_cache_purgeID
#elif defined(CPU_ARM9)
#define cpu_idcache_wbinv_all arm9_idcache_wbinv_all
#elif defined(CPU_FA526) || defined(CPU_FA626TE)
#define cpu_idcache_wbinv_all fa526_idcache_wbinv_all
#elif defined(CPU_ARM9E)
#define cpu_idcache_wbinv_all armv5_ec_idcache_wbinv_all
#elif defined(CPU_ARM10)
#define cpu_idcache_wbinv_all arm10_idcache_wbinv_all
#elif defined(CPU_SA110) || defined(CPU_SA1110) || defined(CPU_SA1100) || \
defined(CPU_IXP12X0)
#define cpu_idcache_wbinv_all sa1_cache_purgeID
#elif defined(CPU_XSCALE_80200) || defined(CPU_XSCALE_80321) || \
defined(CPU_XSCALE_PXA2X0) || defined(CPU_XSCALE_IXP425) || \
defined(CPU_XSCALE_80219)
#define cpu_idcache_wbinv_all xscale_cache_purgeID
#elif defined(CPU_XSCALE_81342)
#define cpu_idcache_wbinv_all xscalec3_cache_purgeID
#endif
#ifdef CPU_XSCALE_81342
#define cpu_l2cache_wbinv_all xscalec3_l2cache_purge
#elif defined(SOC_MV_KIRKWOOD) || defined(SOC_MV_DISCOVERY)
#define cpu_l2cache_wbinv_all sheeva_l2cache_wbinv_all
#else
#define cpu_l2cache_wbinv_all()
#endif
int arm_picache_size;
int arm_picache_line_size;
int arm_picache_ways;
int arm_pdcache_size; /* and unified */
int arm_pdcache_line_size = 32;
int arm_pdcache_ways;
int arm_pcache_type;
int arm_pcache_unified;
int arm_dcache_align;
int arm_dcache_align_mask;
/* Additional cache information local to this file. Log2 of some of the
above numbers. */
static int arm_dcache_l2_nsets;
static int arm_dcache_l2_assoc;
static int arm_dcache_l2_linesize;
int block_userspace_access = 0;
extern int arm9_dcache_sets_inc;
extern int arm9_dcache_sets_max;
extern int arm9_dcache_index_max;
extern int arm9_dcache_index_inc;
static __inline void *
memcpy(void *dst, const void *src, int len)
{
const char *s = src;
char *d = dst;
while (len) {
if (0 && len >= 4 && !((vm_offset_t)d & 3) &&
!((vm_offset_t)s & 3)) {
*(uint32_t *)d = *(uint32_t *)s;
s += 4;
d += 4;
len -= 4;
} else {
*d++ = *s++;
len--;
}
}
return (dst);
}
static __inline void
bzero(void *addr, int count)
{
char *tmp = (char *)addr;
while (count > 0) {
if (count >= 4 && !((vm_offset_t)tmp & 3)) {
*(uint32_t *)tmp = 0;
tmp += 4;
count -= 4;
} else {
*tmp = 0;
tmp++;
count--;
}
}
}
static void arm9_setup(void);
void
_startC(void)
{
int physaddr = KERNPHYSADDR;
int tmp1;
unsigned int sp = ((unsigned int)&_end & ~3) + 4;
#if defined(FLASHADDR) && defined(LOADERRAMADDR)
unsigned int pc;
__asm __volatile("mov %0, pc\n"
: "=r" (pc));
if ((FLASHADDR > LOADERRAMADDR && pc >= FLASHADDR) ||
(FLASHADDR < LOADERRAMADDR && pc < LOADERRAMADDR)) {
/*
* We're running from flash, so just copy the whole thing
* from flash to memory.
* This is far from optimal, we could do the relocation or
* the unzipping directly from flash to memory to avoid this
* needless copy, but it would require to know the flash
* physical address.
*/
unsigned int target_addr;
unsigned int tmp_sp;
uint32_t src_addr = (uint32_t)&_start - PHYSADDR + FLASHADDR
+ (pc - FLASHADDR - ((uint32_t)&_startC - PHYSADDR)) & 0xfffff000;
target_addr = (unsigned int)&_start - PHYSADDR + LOADERRAMADDR;
tmp_sp = target_addr + 0x100000 +
(unsigned int)&_end - (unsigned int)&_start;
memcpy((char *)target_addr, (char *)src_addr,
(unsigned int)&_end - (unsigned int)&_start);
/* Temporary set the sp and jump to the new location. */
__asm __volatile(
"mov sp, %1\n"
"mov pc, %0\n"
: : "r" (target_addr), "r" (tmp_sp));
}
#endif
#ifdef KZIP
sp += KERNSIZE + 0x100;
sp &= ~(L1_TABLE_SIZE - 1);
sp += 2 * L1_TABLE_SIZE;
#endif
sp += 1024 * 1024; /* Should be enough for a stack */
__asm __volatile("adr %0, 2f\n"
"bic %0, %0, #0xff000000\n"
"and %1, %1, #0xff000000\n"
"orr %0, %0, %1\n"
"mrc p15, 0, %1, c1, c0, 0\n"
"bic %1, %1, #1\n" /* Disable MMU */
"orr %1, %1, #(4 | 8)\n" /* Add DC enable,
WBUF enable */
"orr %1, %1, #0x1000\n" /* Add IC enable */
"orr %1, %1, #(0x800)\n" /* BPRD enable */
"mcr p15, 0, %1, c1, c0, 0\n"
"nop\n"
"nop\n"
"nop\n"
"mov pc, %0\n"
"2: nop\n"
"mov sp, %2\n"
: "=r" (tmp1), "+r" (physaddr), "+r" (sp));
#ifndef KZIP
#ifdef CPU_ARM9
/* So that idcache_wbinv works; */
if ((cpufunc_id() & 0x0000f000) == 0x00009000)
arm9_setup();
#endif
cpu_idcache_wbinv_all();
cpu_l2cache_wbinv_all();
#endif
__start();
}
static void
get_cachetype_cp15()
{
u_int ctype, isize, dsize;
u_int multiplier;
__asm __volatile("mrc p15, 0, %0, c0, c0, 1"
: "=r" (ctype));
/*
* ...and thus spake the ARM ARM:
*
* If an <opcode2> value corresponding to an unimplemented or
* reserved ID register is encountered, the System Control
* processor returns the value of the main ID register.
*/
if (ctype == cpufunc_id())
goto out;
if ((ctype & CPU_CT_S) == 0)
arm_pcache_unified = 1;
/*
* If you want to know how this code works, go read the ARM ARM.
*/
arm_pcache_type = CPU_CT_CTYPE(ctype);
if (arm_pcache_unified == 0) {
isize = CPU_CT_ISIZE(ctype);
multiplier = (isize & CPU_CT_xSIZE_M) ? 3 : 2;
arm_picache_line_size = 1U << (CPU_CT_xSIZE_LEN(isize) + 3);
if (CPU_CT_xSIZE_ASSOC(isize) == 0) {
if (isize & CPU_CT_xSIZE_M)
arm_picache_line_size = 0; /* not present */
else
arm_picache_ways = 1;
} else {
arm_picache_ways = multiplier <<
(CPU_CT_xSIZE_ASSOC(isize) - 1);
}
arm_picache_size = multiplier << (CPU_CT_xSIZE_SIZE(isize) + 8);
}
dsize = CPU_CT_DSIZE(ctype);
multiplier = (dsize & CPU_CT_xSIZE_M) ? 3 : 2;
arm_pdcache_line_size = 1U << (CPU_CT_xSIZE_LEN(dsize) + 3);
if (CPU_CT_xSIZE_ASSOC(dsize) == 0) {
if (dsize & CPU_CT_xSIZE_M)
arm_pdcache_line_size = 0; /* not present */
else
arm_pdcache_ways = 1;
} else {
arm_pdcache_ways = multiplier <<
(CPU_CT_xSIZE_ASSOC(dsize) - 1);
}
arm_pdcache_size = multiplier << (CPU_CT_xSIZE_SIZE(dsize) + 8);
arm_dcache_align = arm_pdcache_line_size;
arm_dcache_l2_assoc = CPU_CT_xSIZE_ASSOC(dsize) + multiplier - 2;
arm_dcache_l2_linesize = CPU_CT_xSIZE_LEN(dsize) + 3;
arm_dcache_l2_nsets = 6 + CPU_CT_xSIZE_SIZE(dsize) -
CPU_CT_xSIZE_ASSOC(dsize) - CPU_CT_xSIZE_LEN(dsize);
out:
arm_dcache_align_mask = arm_dcache_align - 1;
}
static void
arm9_setup(void)
{
get_cachetype_cp15();
arm9_dcache_sets_inc = 1U << arm_dcache_l2_linesize;
arm9_dcache_sets_max = (1U << (arm_dcache_l2_linesize +
arm_dcache_l2_nsets)) - arm9_dcache_sets_inc;
arm9_dcache_index_inc = 1U << (32 - arm_dcache_l2_assoc);
arm9_dcache_index_max = 0U - arm9_dcache_index_inc;
}
#ifdef KZIP
static unsigned char *orig_input, *i_input, *i_output;
static u_int memcnt; /* Memory allocated: blocks */
static size_t memtot; /* Memory allocated: bytes */
/*
* Library functions required by inflate().
*/
#define MEMSIZ 0x8000
/*
* Allocate memory block.
*/
unsigned char *
kzipmalloc(int size)
{
void *ptr;
static u_char mem[MEMSIZ];
if (memtot + size > MEMSIZ)
return NULL;
ptr = mem + memtot;
memtot += size;
memcnt++;
return ptr;
}
/*
* Free allocated memory block.
*/
void
kzipfree(void *ptr)
{
memcnt--;
if (!memcnt)
memtot = 0;
}
void
putstr(char *dummy)
{
}
static int
input(void *dummy)
{
if ((size_t)(i_input - orig_input) >= KERNCOMPSIZE) {
return (GZ_EOF);
}
return *i_input++;
}
static int
output(void *dummy, unsigned char *ptr, unsigned long len)
{
memcpy(i_output, ptr, len);
i_output += len;
return (0);
}
static void *
inflate_kernel(void *kernel, void *startaddr)
{
struct inflate infl;
char slide[GZ_WSIZE];
orig_input = kernel;
memcnt = memtot = 0;
i_input = (char *)kernel + GZ_HEAD;
if (((char *)kernel)[3] & 0x18) {
while (*i_input)
i_input++;
i_input++;
}
i_output = startaddr;
bzero(&infl, sizeof(infl));
infl.gz_input = input;
infl.gz_output = output;
infl.gz_slide = slide;
inflate(&infl);
return ((char *)(((vm_offset_t)i_output & ~3) + 4));
}
#endif
void *
load_kernel(unsigned int kstart, unsigned int curaddr,unsigned int func_end,
int d)
{
Elf32_Ehdr *eh;
Elf32_Phdr phdr[64] /* XXX */, *php;
Elf32_Shdr shdr[64] /* XXX */;
int i,j;
void *entry_point;
int symtabindex = -1;
int symstrindex = -1;
vm_offset_t lastaddr = 0;
Elf_Addr ssym = 0;
Elf_Dyn *dp;
eh = (Elf32_Ehdr *)kstart;
ssym = 0;
entry_point = (void*)eh->e_entry;
memcpy(phdr, (void *)(kstart + eh->e_phoff ),
eh->e_phnum * sizeof(phdr[0]));
/* Determine lastaddr. */
for (i = 0; i < eh->e_phnum; i++) {
if (lastaddr < (phdr[i].p_vaddr - KERNVIRTADDR + curaddr
+ phdr[i].p_memsz))
lastaddr = phdr[i].p_vaddr - KERNVIRTADDR +
curaddr + phdr[i].p_memsz;
}
/* Save the symbol tables, as there're about to be scratched. */
memcpy(shdr, (void *)(kstart + eh->e_shoff),
sizeof(*shdr) * eh->e_shnum);
if (eh->e_shnum * eh->e_shentsize != 0 &&
eh->e_shoff != 0) {
for (i = 0; i < eh->e_shnum; i++) {
if (shdr[i].sh_type == SHT_SYMTAB) {
for (j = 0; j < eh->e_phnum; j++) {
if (phdr[j].p_type == PT_LOAD &&
shdr[i].sh_offset >=
phdr[j].p_offset &&
(shdr[i].sh_offset +
shdr[i].sh_size <=
phdr[j].p_offset +
phdr[j].p_filesz)) {
shdr[i].sh_offset = 0;
shdr[i].sh_size = 0;
j = eh->e_phnum;
}
}
if (shdr[i].sh_offset != 0 &&
shdr[i].sh_size != 0) {
symtabindex = i;
symstrindex = shdr[i].sh_link;
}
}
}
func_end = roundup(func_end, sizeof(long));
if (symtabindex >= 0 && symstrindex >= 0) {
ssym = lastaddr;
if (d) {
memcpy((void *)func_end, (void *)(
shdr[symtabindex].sh_offset + kstart),
shdr[symtabindex].sh_size);
memcpy((void *)(func_end +
shdr[symtabindex].sh_size),
(void *)(shdr[symstrindex].sh_offset +
kstart), shdr[symstrindex].sh_size);
} else {
lastaddr += shdr[symtabindex].sh_size;
lastaddr = roundup(lastaddr,
sizeof(shdr[symtabindex].sh_size));
lastaddr += sizeof(shdr[symstrindex].sh_size);
lastaddr += shdr[symstrindex].sh_size;
lastaddr = roundup(lastaddr,
sizeof(shdr[symstrindex].sh_size));
}
}
}
if (!d)
return ((void *)lastaddr);
j = eh->e_phnum;
for (i = 0; i < j; i++) {
volatile char c;
if (phdr[i].p_type != PT_LOAD)
continue;
memcpy((void *)(phdr[i].p_vaddr - KERNVIRTADDR + curaddr),
(void*)(kstart + phdr[i].p_offset), phdr[i].p_filesz);
/* Clean space from oversized segments, eg: bss. */
if (phdr[i].p_filesz < phdr[i].p_memsz)
bzero((void *)(phdr[i].p_vaddr - KERNVIRTADDR +
curaddr + phdr[i].p_filesz), phdr[i].p_memsz -
phdr[i].p_filesz);
}
/* Now grab the symbol tables. */
if (symtabindex >= 0 && symstrindex >= 0) {
*(Elf_Size *)lastaddr =
shdr[symtabindex].sh_size;
lastaddr += sizeof(shdr[symtabindex].sh_size);
memcpy((void*)lastaddr,
(void *)func_end,
shdr[symtabindex].sh_size);
lastaddr += shdr[symtabindex].sh_size;
lastaddr = roundup(lastaddr,
sizeof(shdr[symtabindex].sh_size));
*(Elf_Size *)lastaddr =
shdr[symstrindex].sh_size;
lastaddr += sizeof(shdr[symstrindex].sh_size);
memcpy((void*)lastaddr,
(void*)(func_end +
shdr[symtabindex].sh_size),
shdr[symstrindex].sh_size);
lastaddr += shdr[symstrindex].sh_size;
lastaddr = roundup(lastaddr,
sizeof(shdr[symstrindex].sh_size));
*(Elf_Addr *)curaddr = MAGIC_TRAMP_NUMBER;
*((Elf_Addr *)curaddr + 1) = ssym - curaddr + KERNVIRTADDR;
*((Elf_Addr *)curaddr + 2) = lastaddr - curaddr + KERNVIRTADDR;
} else
*(Elf_Addr *)curaddr = 0;
/* Invalidate the instruction cache. */
__asm __volatile("mcr p15, 0, %0, c7, c5, 0\n"
"mcr p15, 0, %0, c7, c10, 4\n"
: : "r" (curaddr));
__asm __volatile("mrc p15, 0, %0, c1, c0, 0\n"
"bic %0, %0, #1\n" /* MMU_ENABLE */
"mcr p15, 0, %0, c1, c0, 0\n"
: "=r" (ssym));
/* Jump to the entry point. */
((void(*)(void))(entry_point - KERNVIRTADDR + curaddr))();
__asm __volatile(".globl func_end\n"
"func_end:");
}
extern char func_end[];
#define PMAP_DOMAIN_KERNEL 0 /*
* Just define it instead of including the
* whole VM headers set.
*/
int __hack;
static __inline void
setup_pagetables(unsigned int pt_addr, vm_paddr_t physstart, vm_paddr_t physend,
int write_back)
{
unsigned int *pd = (unsigned int *)pt_addr;
vm_paddr_t addr;
int domain = (DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) | DOMAIN_CLIENT;
int tmp;
bzero(pd, L1_TABLE_SIZE);
for (addr = physstart; addr < physend; addr += L1_S_SIZE) {
pd[addr >> L1_S_SHIFT] = L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW)|
L1_S_DOM(PMAP_DOMAIN_KERNEL) | addr;
if (write_back && 0)
pd[addr >> L1_S_SHIFT] |= L1_S_B;
}
/* XXX: See below */
if (0xfff00000 < physstart || 0xfff00000 > physend)
pd[0xfff00000 >> L1_S_SHIFT] = L1_TYPE_S|L1_S_AP(AP_KRW)|
L1_S_DOM(PMAP_DOMAIN_KERNEL)|physstart;
__asm __volatile("mcr p15, 0, %1, c2, c0, 0\n" /* set TTB */
"mcr p15, 0, %1, c8, c7, 0\n" /* Flush TTB */
"mcr p15, 0, %2, c3, c0, 0\n" /* Set DAR */
"mrc p15, 0, %0, c1, c0, 0\n"
"orr %0, %0, #1\n" /* MMU_ENABLE */
"mcr p15, 0, %0, c1, c0, 0\n"
"mrc p15, 0, %0, c2, c0, 0\n" /* CPWAIT */
"mov r0, r0\n"
"sub pc, pc, #4\n" :
"=r" (tmp) : "r" (pd), "r" (domain));
/*
* XXX: This is the most stupid workaround I've ever wrote.
* For some reason, the KB9202 won't boot the kernel unless
* we access an address which is not in the
* 0x20000000 - 0x20ffffff range. I hope I'll understand
* what's going on later.
*/
__hack = *(volatile int *)0xfffff21c;
}
void
__start(void)
{
void *curaddr;
void *dst, *altdst;
char *kernel = (char *)&kernel_start;
int sp;
int pt_addr;
__asm __volatile("mov %0, pc" :
"=r" (curaddr));
curaddr = (void*)((unsigned int)curaddr & 0xfff00000);
#ifdef KZIP
if (*kernel == 0x1f && kernel[1] == 0x8b) {
pt_addr = (((int)&_end + KERNSIZE + 0x100) &
~(L1_TABLE_SIZE - 1)) + L1_TABLE_SIZE;
#ifdef CPU_ARM9
/* So that idcache_wbinv works; */
if ((cpufunc_id() & 0x0000f000) == 0x00009000)
arm9_setup();
#endif
setup_pagetables(pt_addr, (vm_paddr_t)curaddr,
(vm_paddr_t)curaddr + 0x10000000, 1);
/* Gzipped kernel */
dst = inflate_kernel(kernel, &_end);
kernel = (char *)&_end;
altdst = 4 + load_kernel((unsigned int)kernel,
(unsigned int)curaddr,
(unsigned int)&func_end + 800 , 0);
if (altdst > dst)
dst = altdst;
} else
#endif
dst = 4 + load_kernel((unsigned int)&kernel_start,
(unsigned int)curaddr,
(unsigned int)&func_end, 0);
dst = (void *)(((vm_offset_t)dst & ~3));
pt_addr = ((unsigned int)dst &~(L1_TABLE_SIZE - 1)) + L1_TABLE_SIZE;
setup_pagetables(pt_addr, (vm_paddr_t)curaddr,
(vm_paddr_t)curaddr + 0x10000000, 0);
sp = pt_addr + L1_TABLE_SIZE + 8192;
sp = sp &~3;
dst = (void *)(sp + 4);
memcpy((void *)dst, (void *)&load_kernel, (unsigned int)&func_end -
(unsigned int)&load_kernel + 800);
do_call(dst, kernel, dst + (unsigned int)(&func_end) -
(unsigned int)(&load_kernel) + 800, sp);
}