arch/arm-raspi/kernel/kernel_startup.c

   1 /*
   2     Copyright � 2013-2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #define DEBUG 0
   7
   8 #include <aros/kernel.h>
   9 #include <aros/symbolsets.h>
  10
  11 #include <aros/arm/cpucontext.h>
  12
  13 #include <exec/memory.h>
  14 #include <exec/tasks.h>
  15 #include <exec/alerts.h>
  16 #include <exec/execbase.h>
  17 #include <asm/io.h>
  18 #include <proto/kernel.h>
  19 #include <proto/exec.h>
  20 #include <strings.h>
  21
  22 #include "exec_intern.h"
  23 #include "etask.h"
  24
  25 #include "kernel_intern.h"
  26 #include "kernel_debug.h"
  27 #include "kernel_fb.h"
  28 #include "kernel_romtags.h"
  29
  30 extern void krnCreateMemHeader(CONST_STRPTR name, BYTE pri, APTR start, IPTR size, ULONG flags);
  31
  32 void __attribute__((used)) kernel_cstart(struct TagItem *msg);
  33
  34 uint32_t stack[STACK_SIZE] __attribute__((used,aligned(16)));
  35 static uint32_t stack_super[STACK_SIZE] __attribute__((used,aligned(16)));
  36 static uint32_t stack_abort[STACK_SIZE] __attribute__((used,aligned(16)));
  37 static uint32_t stack_irq[STACK_SIZE] __attribute__((used,aligned(16)));
  38
  39 asm (
  40     ".section .aros.init,\"ax\"\n\t"
  41     ".globl start\n\t"
  42     ".type start,%function\n"
  43     "start:\n"
  44     "           push {r0}                    \n"
  45     "           bl      __clear_bss          \n"
  46     "           pop {r0}                     \n"
  47     "           cps     #0x1f                \n" /* system mode */
  48     "           ldr     sp, stack_end        \n"
  49     "           cps     #0x17                \n" /* abort mode */
  50     "           ldr     sp, stack_abort_end  \n"
  51     "           cps     #0x12                \n" /* IRQ mode */
  52     "           ldr     sp, stack_irq_end    \n"
  53     "           cps     #0x13                \n" /* SVC (supervisor) mode */
  54     "           ldr     sp, stack_super_end  \n"
  55     "           b       kernel_cstart        \n"
  56
  57     ".string \"Native/CORE v3 (" __DATE__ ")\"" "\n\t\n\t"
  58 );
  59
  60 static uint32_t * const stack_end __attribute__((used, section(".aros.init"))) = &stack[STACK_SIZE - sizeof(IPTR)];
  61 static uint32_t * const stack_super_end __attribute__((used, section(".aros.init"))) = &stack_super[STACK_SIZE - sizeof(IPTR)];
  62 static uint32_t * const stack_abort_end __attribute__((used, section(".aros.init"))) = &stack_abort[STACK_SIZE - sizeof(IPTR)];
  63 static uint32_t * const stack_irq_end __attribute__((used, section(".aros.init"))) = &stack_irq[STACK_SIZE - sizeof(IPTR)];
  64
  65 struct ExecBase *SysBase __attribute__((section(".data"))) = NULL;
  66 struct ARM_Implementation krnARMImpl  __attribute__((section(".data")));
  67
  68 extern struct TagItem *BootMsg;
  69
  70 static void __attribute__((used)) __clear_bss(struct TagItem *msg)
  71 {
  72     struct KernelBSS *bss = (struct KernelBSS *)krnGetTagData(KRN_KernelBss, 0, msg);
  73     register unsigned int dest;
  74     unsigned int length;
  75
  76     if (bss)
  77     {
  78         while (bss->addr && bss->len)
  79         {
  80             dest = bss->addr;
  81             length = bss->len;
  82
  83             // If the start address is unaligned, fill in the first 1-3 bytes until it is
  84             while((dest & 3) && length)
  85             {
  86                 *((unsigned char *)dest) = 0;
  87                 dest++;
  88                 length--;
  89             }
  90
  91             // Fill in the remaining 32-bit word-aligned memory locations
  92             while(length & 0xfffffffc)
  93             {
  94                 *((unsigned int *)dest) = 0;
  95                 dest += 4;
  96                 length -= 4;
  97             }
  98
  99             // Deal with the remaining 1-3 bytes, if any
 100             while(length)
 101             {
 102                 dest++;
 103                 length--;
 104                 *((unsigned char *)dest) = 0;
 105             }
 106             bss++;
 107         }
 108     }
 109 }
 110
 111 uint32_t __arm_periiobase = 0;
 112
 113 void __attribute__((used)) kernel_cstart(struct TagItem *msg)
 114 {
 115     UWORD *ranges[3];
 116     struct MinList memList;
 117     struct MemHeader *mh;
 118     struct MemChunk *mc;
 119     long unsigned int memlower = 0, memupper = 0, protlower = 0, protupper = 0;
 120     BootMsg = msg;
 121
 122     cpu_Probe(&krnARMImpl);
 123     platform_Init(&krnARMImpl, msg);
 124     cpu_Init(&krnARMImpl, msg);
 125
 126     /* NB: the bootstrap has conveniently setup the framebuffer
 127             and initialised the serial port and led for us */
 128
 129     while(msg->ti_Tag != TAG_DONE)
 130     {
 131         switch (msg->ti_Tag)
 132         {
 133         case KRN_FuncPutC:
 134             _KrnPutC = msg->ti_Data;
 135             _KrnPutC(0xFF); // Clear the display
 136             break;
 137         case KRN_MEMLower:
 138             memlower = msg->ti_Data;
 139             break;
 140         case KRN_MEMUpper:
 141             memupper = msg->ti_Data;
 142             break;
 143         case KRN_ProtAreaStart:
 144             protlower = msg->ti_Data;
 145             break;
 146         case KRN_ProtAreaEnd:
 147             protupper = msg->ti_Data;
 148             break;
 149         case KRN_KernelBase:
 150             /*
 151              * KRN_KernelBase is actually a border between read-only
 152              * (code) and read-write (data) sections of the kickstart.
 153              * read-write section goes to lower addresses from this one,
 154              * so we align it upwards in order not to make part of RW data
 155              * read-only.
 156              */
 157 //            addr = AROS_ROUNDUP2(msg->ti_Data, PAGE_SIZE);
 158             break;
 159         }
 160         msg++;
 161     }
 162     msg = BootMsg;
 163
 164     D(bug("[KRN] AROS Raspberry Pi Kernel built on %s\n", __DATE__));
 165
 166     D(bug("[KRN] Entered kernel_cstart @ 0x%p, BootMsg @ %p\n", kernel_cstart, BootMsg));
 167
 168     D(
 169         if (_KrnPutC)
 170         {
 171             bug("[KRN] Using boostrap PutC implementation @ %p\n", _KrnPutC);
 172         }
 173     )
 174
 175     core_SetupIntr();
 176
 177     if (krnARMImpl.ARMI_LED_Toggle)
 178     {
 179         krnARMImpl.ARMI_LED_Toggle(ARM_LED_POWER, ARM_LED_OFF);
 180         if (krnARMImpl.ARMI_Delay)
 181             krnARMImpl.ARMI_Delay(1500);
 182         krnARMImpl.ARMI_LED_Toggle(ARM_LED_POWER, ARM_LED_ON);
 183     }
 184
 185     NEWLIST(&memList);
 186
 187     mh = (struct MemHeader *)memlower;
 188     krnCreateMemHeader("System Memory", 0, mh, protlower - (long unsigned int)mh, MEMF_FAST | MEMF_PUBLIC | MEMF_KICK | MEMF_LOCAL);
 189
 190     mc = (struct MemChunk *)((protupper + MEMCHUNK_TOTAL-1) & ~(MEMCHUNK_TOTAL-1));
 191     mc->mc_Bytes = memupper - (long unsigned int)mc;
 192     mc->mc_Next = NULL;
 193
 194     if (mh->mh_First->mc_Next == NULL)
 195     {
 196         mh->mh_First->mc_Next = mc;
 197         mh->mh_Upper = memupper;
 198         mh->mh_Free += mc->mc_Bytes;
 199     }
 200
 201     ranges[0] = (UWORD *)krnGetTagData(KRN_KernelLowest, 0, msg);
 202     ranges[1] = (UWORD *)krnGetTagData(KRN_KernelHighest, 0, msg);
 203     ranges[2] = (UWORD *)-1;
 204
 205     D(bug("[KRN] Preparing ExecBase (memheader @ 0x%p)\n", mh));
 206     krnPrepareExecBase(ranges, mh, BootMsg);
 207
 208     /*
 209      * Make kickstart code area read-only.
 210      * We do it only after ExecBase creation because SysBase pointer is put
 211      * into .rodata. This way we prevent it from ocassional modification by buggy software.
 212      */
 213 //    core_ProtKernelArea(addr, kick_highest - addr, 1, 0, 1);
 214
 215     D(bug("[KRN] InitCode(RTF_SINGLETASK) ... \n"));
 216     InitCode(RTF_SINGLETASK, 0);
 217
 218     D(bug("[KRN] InitCode(RTF_COLDSTART) ...\n"));
 219
 220     asm("cps %[mode_user]\n" : : [mode_user] "I" (CPUMODE_USER)); /* switch to user mode */
 221
 222     InitCode(RTF_COLDSTART, 0);
 223
 224     /* The above should not return */
 225     krnPanic(KernelBase, "System Boot Failed!");
 226 }