Date: Fri, 19 Aug 2016 18:02:36 +0000 (UTC) From: Emmanuel Vadot <manu@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r304488 - head/sys/arm/arm Message-ID: <201608191802.u7JI2ana033950@repo.freebsd.org>
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Author: manu Date: Fri Aug 19 18:02:36 2016 New Revision: 304488 URL: https://svnweb.freebsd.org/changeset/base/304488 Log: Keep boot parameters in ARM trampoline code Currently boot parameters (r0 - r3) are forgotten in ARM trampoline code. This patch save them at startup and restore them before jumping into kernel _start() routine. This is usefull when booting with Linux ABI and/or custom bootloader. Submitted by: Grégory Soutadé <soutade@gmail.com> Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D7395 Modified: head/sys/arm/arm/elf_trampoline.c Modified: head/sys/arm/arm/elf_trampoline.c ============================================================================== --- head/sys/arm/arm/elf_trampoline.c Fri Aug 19 17:57:14 2016 (r304487) +++ head/sys/arm/arm/elf_trampoline.c Fri Aug 19 18:02:36 2016 (r304488) @@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$"); #include <machine/pte-v4.h> #include <machine/cpufunc.h> #include <machine/armreg.h> +#include <machine/cpu.h> extern char kernel_start[]; extern char kernel_end[]; @@ -47,7 +48,7 @@ extern void *_end; void _start(void); void __start(void); -void __startC(void); +void __startC(unsigned r0, unsigned r1, unsigned r2, unsigned r3); extern unsigned int cpu_ident(void); extern void armv6_idcache_wbinv_all(void); @@ -124,6 +125,10 @@ static int arm_dcache_l2_nsets; static int arm_dcache_l2_assoc; static int arm_dcache_l2_linesize; +/* + * Boot parameters + */ +static struct arm_boot_params s_boot_params; extern int arm9_dcache_sets_inc; extern int arm9_dcache_sets_max; @@ -172,12 +177,17 @@ bzero(void *addr, int count) static void arm9_setup(void); void -_startC(void) +_startC(unsigned r0, unsigned r1, unsigned r2, unsigned r3) { int tmp1; unsigned int sp = ((unsigned int)&_end & ~3) + 4; unsigned int pc, kernphysaddr; + s_boot_params.abp_r0 = r0; + s_boot_params.abp_r1 = r1; + s_boot_params.abp_r2 = r2; + s_boot_params.abp_r3 = r3; + /* * Figure out the physical address the kernel was loaded at. This * assumes the entry point (this code right here) is in the first page, @@ -211,8 +221,15 @@ _startC(void) /* Temporary set the sp and jump to the new location. */ __asm __volatile( "mov sp, %1\n" + "mov r0, %2\n" + "mov r1, %3\n" + "mov r2, %4\n" + "mov r3, %5\n" "mov pc, %0\n" - : : "r" (target_addr), "r" (tmp_sp)); + : : "r" (target_addr), "r" (tmp_sp), + "r" (s_boot_params.abp_r0), "r" (s_boot_params.abp_r1), + "r" (s_boot_params.abp_r2), "r" (s_boot_params.abp_r3), + : "r0", "r1", "r2", "r3"); } #endif @@ -487,6 +504,7 @@ load_kernel(unsigned int kstart, unsigne vm_offset_t lastaddr = 0; Elf_Addr ssym = 0; Elf_Dyn *dp; + struct arm_boot_params local_boot_params; eh = (Elf32_Ehdr *)kstart; ssym = 0; @@ -555,6 +573,12 @@ load_kernel(unsigned int kstart, unsigne if (!d) return ((void *)lastaddr); + /* + * Now the stack is fixed, copy boot params + * before it's overrided + */ + memcpy(&local_boot_params, &s_boot_params, sizeof(local_boot_params)); + j = eh->e_phnum; for (i = 0; i < j; i++) { volatile char c; @@ -604,7 +628,10 @@ load_kernel(unsigned int kstart, unsigne "mcr p15, 0, %0, c1, c0, 0\n" /* CP15_SCTLR(%0)*/ : "=r" (ssym)); /* Jump to the entry point. */ - ((void(*)(void))(entry_point - KERNVIRTADDR + curaddr))(); + ((void(*)(unsigned, unsigned, unsigned, unsigned)) + (entry_point - KERNVIRTADDR + curaddr)) + (local_boot_params.abp_r0, local_boot_params.abp_r1, + local_boot_params.abp_r2, local_boot_params.abp_r3); __asm __volatile(".globl func_end\n" "func_end:");
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