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x86: add thread support

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Thread support is added for the x86 architecture. Both
the local apic and the tsc udelay() functions have a
call to thread_yield_microseconds() so as to provide an
opportunity to run pending threads.

Change-Id: Ie39b9eb565eb189676c06645bdf2a8720fe0636a
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/3207
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Aaron Durbin
2013-05-06 12:22:23 -05:00
committed by Ronald G. Minnich
parent 4409a5eef6
commit 38c326d041
9 changed files with 140 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/arch/x86/lib/Makefile.inc
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@@ -9,6 +9,8 @@ ramstage-y += memset.c
ramstage-y += memcpy.c
ramstage-y += ebda.c
ramstage-y += rom_media.c
ramstage-$(CONFIG_COOP_MULTITASKING) += thread.c
ramstage-$(CONFIG_COOP_MULTITASKING) += thread_switch.S
romstage-$(CONFIG_EARLY_CONSOLE) += romstage_console.c
romstage-y += cbfs_and_run.c

9
src/arch/x86/lib/c_start.S
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@@ -10,6 +10,11 @@
_stack:
.space CONFIG_MAX_CPUS*CONFIG_STACK_SIZE
_estack:
#if CONFIG_COOP_MULTITASKING
.global thread_stacks
thread_stacks:
.space CONFIG_STACK_SIZE*CONFIG_NUM_THREADS
#endif
.section ".textfirst", "ax", @progbits
.code32
@@ -45,6 +50,10 @@ _start:
/* set new stack */
movl $_estack, %esp
#if CONFIG_COOP_MULTITASKING
/* Push the thread pointer. */
pushl $0
#endif
/* Push the cpu index and struct cpu */
pushl $0
pushl $0

58
src/arch/x86/lib/thread.c Normal file
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@@ -0,0 +1,58 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <thread.h>
/* The stack frame looks like the following after a pushad instruction. */
struct pushad_regs {
uint32_t edi; /* Offset 0x00 */
uint32_t esi; /* Offset 0x04 */
uint32_t ebp; /* Offset 0x08 */
uint32_t esp; /* Offset 0x0c */
uint32_t ebx; /* Offset 0x10 */
uint32_t edx; /* Offset 0x14 */
uint32_t ecx; /* Offset 0x18 */
uint32_t eax; /* Offset 0x1c */
};
static inline uintptr_t push_stack(uintptr_t cur_stack, uintptr_t value)
{
uintptr_t *addr;
cur_stack -= sizeof(value);
addr = (uintptr_t *)cur_stack;
*addr = value;
return cur_stack;
}
void arch_prepare_thread(struct thread *t,
void asmlinkage (*thread_entry)(void *), void *arg)
{
uintptr_t stack = t->stack_current;
/* Imitate thread_entry(t) with return address of 0. thread_entry()
* is assumed to never return. */
stack = push_stack(stack, (uintptr_t)arg);
stack = push_stack(stack, (uintptr_t)0);
stack = push_stack(stack, (uintptr_t)thread_entry);
/* Make room for the registers. Ignore intial values. */
stack -= sizeof(struct pushad_regs);
t->stack_current = stack;
}

58
src/arch/x86/lib/thread_switch.S Normal file
View File

@@ -0,0 +1,58 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
.code32
.text
/*
* stack layout after pushad:
* +------------+
* | save stack | <-- esp + 0x28
* +------------+
* | new stack | <-- esp + 0x24
* +------------+
* | ret addr | <-- esp + 0x20
* +------------+
* | eax | <-- esp + 0x1c
* +------------+
* | ecx | <-- esp + 0x18
* +------------+
* | edx | <-- esp + 0x14
* +------------+
* | ebx | <-- esp + 0x10
* +------------+
* | orig esp | <-- esp + 0x0c
* +------------+
* | ebp | <-- esp + 0x08
* +------------+
* | esi | <-- esp + 0x04
* +------------+
* | edi | <-- esp + 0x00
* +------------+
*/
.globl switch_to_thread
switch_to_thread:
pusha
/* Save the current stack */
movl 0x28(%esp), %ebx
movl %esp, (%ebx)
/* Switch to the new stack. */
movl 0x24(%esp), %eax
movl %eax, %esp
popa
ret