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