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