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  1. /*
  2.  * Copyright (c) 2003-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  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
  15.  *   derived from this software without specific prior written permission.
  16.  *
  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
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  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
  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
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup mips32
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch.h>
  36. #include <arch/cp0.h>
  37. #include <arch/exception.h>
  38. #include <mm/as.h>
  39. #include <userspace.h>
  40. #include <memstr.h>
  41. #include <proc/thread.h>
  42. #include <proc/uarg.h>
  43. #include <print.h>
  44. #include <console/console.h>
  45. #include <syscall/syscall.h>
  46. #include <sysinfo/sysinfo.h>
  47. #include <arch/interrupt.h>
  48. #include <console/chardev.h>
  49. #include <arch/barrier.h>
  50. #include <arch/debugger.h>
  51. #include <genarch/fb/fb.h>
  52. #include <genarch/fb/visuals.h>
  53. #include <genarch/drivers/dsrln/dsrlnin.h>
  54. #include <genarch/drivers/dsrln/dsrlnout.h>
  55. #include <genarch/srln/srln.h>
  56. #include <macros.h>
  57. #include <config.h>
  58. #include <string.h>
  59. #include <arch/drivers/msim.h>
  60. #include <arch/asm/regname.h>
  61.  
  62. /* Size of the code jumping to the exception handler code
  63.  * - J+NOP
  64.  */
  65. #define EXCEPTION_JUMP_SIZE  8
  66.  
  67. #define TLB_EXC    ((char *) 0x80000000)
  68. #define NORM_EXC   ((char *) 0x80000180)
  69. #define CACHE_EXC  ((char *) 0x80000100)
  70.  
  71.  
  72. /* Why the linker moves the variable 64K away in assembler
  73.  * when not in .text section?
  74.  */
  75.  
  76. /* Stack pointer saved when entering user mode */
  77. uintptr_t supervisor_sp __attribute__ ((section (".text")));
  78.  
  79. size_t cpu_count = 0;
  80.  
  81. /** Performs mips32-specific initialization before main_bsp() is called. */
  82. void arch_pre_main(void *entry __attribute__((unused)), bootinfo_t *bootinfo)
  83. {
  84.     /* Setup usermode */
  85.     init.cnt = bootinfo->cnt;
  86.    
  87.     size_t i;
  88.     for (i = 0; i < min3(bootinfo->cnt, TASKMAP_MAX_RECORDS, CONFIG_INIT_TASKS); i++) {
  89.         init.tasks[i].addr = bootinfo->tasks[i].addr;
  90.         init.tasks[i].size = bootinfo->tasks[i].size;
  91.         str_cpy(init.tasks[i].name, CONFIG_TASK_NAME_BUFLEN,
  92.             bootinfo->tasks[i].name);
  93.     }
  94.    
  95.     for (i = 0; i < CPUMAP_MAX_RECORDS; i++) {
  96.         if ((bootinfo->cpumap & (1 << i)) != 0)
  97.             cpu_count++;
  98.     }
  99. }
  100.  
  101. void arch_pre_mm_init(void)
  102. {
  103.     /* It is not assumed by default */
  104.     interrupts_disable();
  105.    
  106.     /* Initialize dispatch table */
  107.     exception_init();
  108.  
  109.     /* Copy the exception vectors to the right places */
  110.     memcpy(TLB_EXC, (char *) tlb_refill_entry, EXCEPTION_JUMP_SIZE);
  111.     smc_coherence_block(TLB_EXC, EXCEPTION_JUMP_SIZE);
  112.     memcpy(NORM_EXC, (char *) exception_entry, EXCEPTION_JUMP_SIZE);
  113.     smc_coherence_block(NORM_EXC, EXCEPTION_JUMP_SIZE);
  114.     memcpy(CACHE_EXC, (char *) cache_error_entry, EXCEPTION_JUMP_SIZE);
  115.     smc_coherence_block(CACHE_EXC, EXCEPTION_JUMP_SIZE);
  116.    
  117.     /*
  118.      * Switch to BEV normal level so that exception vectors point to the
  119.      * kernel. Clear the error level.
  120.      */
  121.     cp0_status_write(cp0_status_read() &
  122.         ~(cp0_status_bev_bootstrap_bit | cp0_status_erl_error_bit));
  123.    
  124.     /*
  125.      * Mask all interrupts
  126.      */
  127.     cp0_mask_all_int();
  128.    
  129.     debugger_init();
  130. }
  131.  
  132. void arch_post_mm_init(void)
  133. {
  134.     interrupt_init();
  135.    
  136. #ifdef CONFIG_FB
  137.     /* GXemul framebuffer */
  138.     fb_properties_t gxemul_prop = {
  139.         .addr = 0x12000000,
  140.         .offset = 0,
  141.         .x = 640,
  142.         .y = 480,
  143.         .scan = 1920,
  144.         .visual = VISUAL_RGB_8_8_8,
  145.     };
  146.     fb_init(&gxemul_prop);
  147. #else
  148. #ifdef CONFIG_MIPS_PRN
  149.     dsrlnout_init((ioport8_t *) MSIM_KBD_ADDRESS);
  150. #endif /* CONFIG_MIPS_PRN */
  151. #endif /* CONFIG_FB */
  152. }
  153.  
  154. void arch_post_cpu_init(void)
  155. {
  156. }
  157.  
  158. void arch_pre_smp_init(void)
  159. {
  160. }
  161.  
  162. void arch_post_smp_init(void)
  163. {
  164. #ifdef CONFIG_MIPS_KBD
  165.     /*
  166.      * Initialize the msim/GXemul keyboard port. Then initialize the serial line
  167.      * module and connect it to the msim/GXemul keyboard. Enable keyboard interrupts.
  168.      */
  169.     dsrlnin_instance_t *dsrlnin_instance
  170.         = dsrlnin_init((dsrlnin_t *) MSIM_KBD_ADDRESS, MSIM_KBD_IRQ);
  171.     if (dsrlnin_instance) {
  172.         srln_instance_t *srln_instance = srln_init();
  173.         if (srln_instance) {
  174.             indev_t *sink = stdin_wire();
  175.             indev_t *srln = srln_wire(srln_instance, sink);
  176.             dsrlnin_wire(dsrlnin_instance, srln);
  177.             cp0_unmask_int(MSIM_KBD_IRQ);
  178.         }
  179.     }
  180.    
  181.     /*
  182.      * This is the necessary evil until the userspace driver is entirely
  183.      * self-sufficient.
  184.      */
  185.     sysinfo_set_item_val("kbd", NULL, true);
  186.     sysinfo_set_item_val("kbd.inr", NULL, MSIM_KBD_IRQ);
  187.     sysinfo_set_item_val("kbd.address.virtual", NULL, MSIM_KBD_ADDRESS);
  188. #endif
  189. }
  190.  
  191. void calibrate_delay_loop(void)
  192. {
  193. }
  194.  
  195. void userspace(uspace_arg_t *kernel_uarg)
  196. {
  197.     /* EXL = 1, UM = 1, IE = 1 */
  198.     cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
  199.         cp0_status_um_bit | cp0_status_ie_enabled_bit));
  200.     cp0_epc_write((uintptr_t) kernel_uarg->uspace_entry);
  201.     userspace_asm(((uintptr_t) kernel_uarg->uspace_stack + PAGE_SIZE),
  202.         (uintptr_t) kernel_uarg->uspace_uarg,
  203.         (uintptr_t) kernel_uarg->uspace_entry);
  204.    
  205.     while (1);
  206. }
  207.  
  208. /** Perform mips32 specific tasks needed before the new task is run. */
  209. void before_task_runs_arch(void)
  210. {
  211. }
  212.  
  213. /** Perform mips32 specific tasks needed before the new thread is scheduled. */
  214. void before_thread_runs_arch(void)
  215. {
  216.     supervisor_sp = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
  217.         SP_DELTA];
  218. }
  219.  
  220. void after_thread_ran_arch(void)
  221. {
  222. }
  223.  
  224. /** Set thread-local-storage pointer
  225.  *
  226.  * We have it currently in K1, it is
  227.  * possible to have it separately in the future.
  228.  */
  229. unative_t sys_tls_set(unative_t addr)
  230. {
  231.     return 0;
  232. }
  233.  
  234. void arch_reboot(void)
  235. {
  236.     ___halt();
  237.     while (1);
  238. }
  239.  
  240. /** Construct function pointer
  241.  *
  242.  * @param fptr   function pointer structure
  243.  * @param addr   function address
  244.  * @param caller calling function address
  245.  *
  246.  * @return address of the function pointer
  247.  *
  248.  */
  249. void *arch_construct_function(fncptr_t *fptr, void *addr, void *caller)
  250. {
  251.     return addr;
  252. }
  253.  
  254. void arch_grab_console(void)
  255. {
  256. #ifdef CONFIG_FB
  257.     fb_redraw();
  258. #endif
  259. }
  260.  
  261. /** Return console to userspace
  262.  *
  263.  */
  264. void arch_release_console(void)
  265. {
  266. }
  267.  
  268. /** @}
  269.  */
  270.