WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/mips32/src/mips32.c


/*
 * Copyright (C) 2003-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * 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 <arch.h>
#include <arch/cp0.h>
#include <arch/exception.h>
#include <arch/asm.h>
#include <mm/as.h>
 
#include <userspace.h>
#include <arch/console.h>
#include <memstr.h>
#include <proc/thread.h>
#include <print.h>
 
#include <arch/interrupt.h>
#include <arch/drivers/arc.h>
#include <console/chardev.h>
#include <arch/debugger.h>
 
#include <arch/asm/regname.h>
 
/* Size of the code jumping to the exception handler code
 * - J+NOP
 */
#define EXCEPTION_JUMP_SIZE    8
 
#define TLB_EXC ((char *) 0x80000000)
#define NORM_EXC ((char *) 0x80000180)
#define CACHE_EXC ((char *) 0x80000100)
 
void arch_pre_mm_init(void)
{
    /* It is not assumed by default */
    interrupts_disable();
   
    /* Initialize dispatch table */
    exception_init();
    interrupt_init();
 
    arc_init();
 
    /* Copy the exception vectors to the right places */
    memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
    memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
    memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
 
    /*
     * Switch to BEV normal level so that exception vectors point to the kernel.
     * Clear the error level.
     */
    cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
 
    /*
     * Mask all interrupts
     */
    cp0_mask_all_int();
    /*
     * Unmask hardware clock interrupt.
     */
    cp0_unmask_int(TIMER_IRQ);
 
    /*
     * Start hardware clock.
     */
    cp0_compare_write(cp0_compare_value + cp0_count_read());
 
    console_init();
    debugger_init();
   
    /* Setup usermode */
    init.cnt = 1;
    init.tasks[0].addr = INIT_ADDRESS;
    init.tasks[0].size = INIT_SIZE;
}
 
void arch_post_mm_init(void)
{
}
 
void arch_pre_smp_init(void)
{
}
 
void arch_post_smp_init(void)
{
}
 
/* Stack pointer saved when entering user mode */
/* TODO: How do we do it on SMP system???? */
 
/* Why the linker moves the variable 64K away in assembler
 * when not in .text section ????????
 */
__address supervisor_sp __attribute__ ((section (".text")));
 
void userspace(uspace_arg_t *uarg)
{
    /* EXL=1, UM=1, IE=1 */
    cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
                          cp0_status_um_bit |
                          cp0_status_ie_enabled_bit));
    cp0_epc_write(uarg->uspace_entry);
    userspace_asm(uarg->uspace_stack+PAGE_SIZE);
    while (1)
        ;
}
 
void before_thread_runs_arch(void)
{
    supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
}
 
void after_thread_ran_arch(void)
{
}
 

Rev 1037	Rev 1066
1	/*	1	/*
2	* Copyright (C) 2003-2004 Jakub Jermar	2	* Copyright (C) 2003-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29		29
30	#include <arch.h>	30	#include <arch.h>
31	#include <arch/cp0.h>	31	#include <arch/cp0.h>
32	#include <arch/exception.h>	32	#include <arch/exception.h>
33	#include <arch/asm.h>	33	#include <arch/asm.h>
34	#include <mm/as.h>	34	#include <mm/as.h>
35		35
36	#include <userspace.h>	36	#include <userspace.h>
37	#include <arch/console.h>	37	#include <arch/console.h>
38	#include <memstr.h>	38	#include <memstr.h>
39	#include <proc/thread.h>	39	#include <proc/thread.h>
40	#include <print.h>	40	#include <print.h>
41		41
42	#include <arch/interrupt.h>	42	#include <arch/interrupt.h>
43	#include <arch/drivers/arc.h>	43	#include <arch/drivers/arc.h>
44	#include <console/chardev.h>	44	#include <console/chardev.h>
45	#include <arch/debugger.h>	45	#include <arch/debugger.h>
46		46
47	#include <arch/asm/regname.h>	47	#include <arch/asm/regname.h>
48		48
49	/* Size of the code jumping to the exception handler code	49	/* Size of the code jumping to the exception handler code
50	* - J+NOP	50	* - J+NOP
51	*/	51	*/
52	#define EXCEPTION_JUMP_SIZE 8	52	#define EXCEPTION_JUMP_SIZE 8
53		53
54	#define TLB_EXC ((char *) 0x80000000)	54	#define TLB_EXC ((char *) 0x80000000)
55	#define NORM_EXC ((char *) 0x80000180)	55	#define NORM_EXC ((char *) 0x80000180)
56	#define CACHE_EXC ((char *) 0x80000100)	56	#define CACHE_EXC ((char *) 0x80000100)
57		57
58	void arch_pre_mm_init(void)	58	void arch_pre_mm_init(void)
59	{	59	{
60	/* It is not assumed by default */	60	/* It is not assumed by default */
61	interrupts_disable();	61	interrupts_disable();
62		62
63	/* Initialize dispatch table */	63	/* Initialize dispatch table */
64	exception_init();	64	exception_init();
65	interrupt_init();	65	interrupt_init();
66		66
67	arc_init();	67	arc_init();
68		68
69	/* Copy the exception vectors to the right places */	69	/* Copy the exception vectors to the right places */
70	memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);	70	memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
71	memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);	71	memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
72	memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);	72	memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
73		73
74	/*	74	/*
75	* Switch to BEV normal level so that exception vectors point to the kernel.	75	* Switch to BEV normal level so that exception vectors point to the kernel.
76	* Clear the error level.	76	* Clear the error level.
77	*/	77	*/
78	cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit\|cp0_status_erl_error_bit));	78	cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit\|cp0_status_erl_error_bit));
79		79
80	/*	80	/*
81	* Mask all interrupts	81	* Mask all interrupts
82	*/	82	*/
83	cp0_mask_all_int();	83	cp0_mask_all_int();
84	/*	84	/*
85	* Unmask hardware clock interrupt.	85	* Unmask hardware clock interrupt.
86	*/	86	*/
87	cp0_unmask_int(TIMER_IRQ);	87	cp0_unmask_int(TIMER_IRQ);
88		88
89	/*	89	/*
90	* Start hardware clock.	90	* Start hardware clock.
91	*/	91	*/
92	cp0_compare_write(cp0_compare_value + cp0_count_read());	92	cp0_compare_write(cp0_compare_value + cp0_count_read());
93		93
94	console_init();	94	console_init();
95	debugger_init();	95	debugger_init();
96		96
97	/* Setup usermode */	97	/* Setup usermode */
98	init.cnt = 1;	98	init.cnt = 1;
99	init.tasks[0].addr = INIT_ADDRESS;	99	init.tasks[0].addr = INIT_ADDRESS;
100	init.tasks[0].size = INIT_SIZE;	100	init.tasks[0].size = INIT_SIZE;
101	}	101	}
102		102
103	void arch_post_mm_init(void)	103	void arch_post_mm_init(void)
104	{	104	{
105	}	105	}
106		106
107	void arch_pre_smp_init(void)	107	void arch_pre_smp_init(void)
108	{	108	{
109	}	109	}
110		110
111	void arch_post_smp_init(void)	111	void arch_post_smp_init(void)
112	{	112	{
113	}	113	}
114		114
115	/* Stack pointer saved when entering user mode */	115	/* Stack pointer saved when entering user mode */
116	/* TODO: How do we do it on SMP system???? */	116	/* TODO: How do we do it on SMP system???? */
117		117
118	/* Why the linker moves the variable 64K away in assembler	118	/* Why the linker moves the variable 64K away in assembler
119	* when not in .text section ????????	119	* when not in .text section ????????
120	*/	120	*/
121	__address supervisor_sp __attribute__ ((section (".text")));	121	__address supervisor_sp __attribute__ ((section (".text")));
122		122
123	void userspace(__address entry)	123	void userspace(uspace_arg_t *uarg)
124	{	124	{
125	/* EXL=1, UM=1, IE=1 */	125	/* EXL=1, UM=1, IE=1 */
126	cp0_status_write(cp0_status_read() \| (cp0_status_exl_exception_bit \|	126	cp0_status_write(cp0_status_read() \| (cp0_status_exl_exception_bit \|
127	cp0_status_um_bit \|	127	cp0_status_um_bit \|
128	cp0_status_ie_enabled_bit));	128	cp0_status_ie_enabled_bit));
129	cp0_epc_write(entry);	129	cp0_epc_write(uarg->uspace_entry);
130	userspace_asm(USTACK_ADDRESS+PAGE_SIZE);	130	userspace_asm(uarg->uspace_stack+PAGE_SIZE);
131	while (1)	131	while (1)
132	;	132	;
133	}	133	}
134		134
135	void before_thread_runs_arch(void)	135	void before_thread_runs_arch(void)
136	{	136	{
137	supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];	137	supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
138	}	138	}
139		139
140	void after_thread_ran_arch(void)	140	void after_thread_ran_arch(void)
141	{	141	{
142	}	142	}
143		143

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/mips32/src/mips32.c @ 1686 – Rev 1037 → 1066