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   1 /*
   2  * Copyright © 2013 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include <ao.h>
  20 #include <string.h>
  21 #include <ao_boot.h>
  22
  23 #ifndef IS_FLASH_LOADER
  24 #error Should define IS_FLASH_LOADER
  25 #define IS_FLASH_LOADER 0
  26 #endif
  27
  28 #if !IS_FLASH_LOADER
  29 #define RELOCATE_INTERRUPT      1
  30 #endif
  31
  32 /* Interrupt functions */
  33
  34 void lpc_halt_isr(void)
  35 {
  36         ao_panic(AO_PANIC_CRASH);
  37 }
  38
  39 void lpc_ignore_isr(void)
  40 {
  41 }
  42
  43 #define STRINGIFY(x) #x
  44
  45 #define isr(name) \
  46         void __attribute__ ((weak)) lpc_ ## name ## _isr(void); \
  47         _Pragma(STRINGIFY(weak lpc_ ## name ## _isr = lpc_ignore_isr))
  48
  49 #define isr_halt(name) \
  50         void __attribute__ ((weak)) lpc_ ## name ## _isr(void); \
  51         _Pragma(STRINGIFY(weak lpc_ ## name ## _isr = lpc_halt_isr))
  52
  53 isr(nmi)
  54 isr_halt(hardfault)
  55 isr_halt(memmanage)
  56 isr_halt(busfault)
  57 isr_halt(usagefault)
  58 isr(svc)
  59 isr(debugmon)
  60 isr(pendsv)
  61 isr(systick)
  62
  63 isr(pin_int0)   /* IRQ0 */
  64 isr(pin_int1)
  65 isr(pin_int2)
  66 isr(pin_int3)
  67 isr(pin_int4)   /* IRQ4 */
  68 isr(pin_int5)
  69 isr(pin_int6)
  70 isr(pin_int7)
  71
  72 isr(gint0)      /* IRQ8 */
  73 isr(gint1)
  74 isr(ssp1)
  75 isr(i2c)
  76
  77 isr(ct16b0)     /* IRQ16 */
  78 isr(ct16b1)
  79 isr(ct32b0)
  80 isr(ct32b1)
  81 isr(ssp0)       /* IRQ20 */
  82 isr(usart)
  83 isr(usb_irq)
  84 isr(usb_fiq)
  85
  86 isr(adc)        /* IRQ24 */
  87 isr(wwdt)
  88 isr(bod)
  89 isr(flash)
  90
  91 isr(usb_wakeup)
  92
  93 #define i(addr,name)    [(addr)/4] = lpc_ ## name ## _isr
  94 #define c(addr,value)   [(addr)/4] = (value)
  95
  96 extern char __stack[];
  97 void _start(void) __attribute__((__noreturn__));
  98
  99 __attribute__ ((section(".init")))
 100 const void *const __interrupt_vector[0x30] = {
 101         [0] = __stack,
 102         [1] = _start,
 103         i(0x08, nmi),
 104         i(0x0c, hardfault),
 105         c(0x10, 0),
 106         c(0x14, 0),
 107         c(0x18, 0),
 108         c(0x1c, 0),
 109         c(0x20, 0),
 110         c(0x24, 0),
 111         c(0x28, 0),
 112         i(0x2c, svc),
 113         i(0x30, hardfault),
 114         i(0x34, hardfault),
 115         i(0x38, pendsv),
 116         i(0x3c, systick),
 117
 118         i(0x40, pin_int0),      /* IRQ0 */
 119         i(0x44, pin_int1),
 120         i(0x48, pin_int2),
 121         i(0x4c, pin_int3),
 122         i(0x50, pin_int4),      /* IRQ4 */
 123         i(0x54, pin_int5),
 124         i(0x58, pin_int6),
 125         i(0x5c, pin_int7),
 126
 127         i(0x60, gint0),         /* IRQ8 */
 128         i(0x64, gint1),
 129         i(0x68, hardfault),
 130         i(0x6c, hardfault),
 131         i(0x70, hardfault),     /* IRQ12 */
 132         i(0x74, hardfault),
 133         i(0x78, ssp1),
 134         i(0x7c, i2c),
 135
 136         i(0x80, ct16b0),        /* IRQ16 */
 137         i(0x84, ct16b1),
 138         i(0x88, ct32b0),
 139         i(0x8c, ct32b1),
 140         i(0x90, ssp0),          /* IRQ20 */
 141         i(0x94, usart),
 142         i(0x98, usb_irq),
 143         i(0x9c, usb_fiq),
 144
 145         i(0xa0, adc),           /* IRQ24 */
 146         i(0xa4, wwdt),
 147         i(0xa8, bod),
 148         i(0xac, flash),
 149
 150         i(0xb0, hardfault),     /* IRQ28 */
 151         i(0xb4, hardfault),
 152         i(0xb8, usb_wakeup),
 153         i(0xbc, hardfault),
 154 };
 155
 156 /*
 157  * Previous versions of this code had a 256 byte interupt vector. Add
 158  * some padding to make sure the other low ROM variables land at the
 159  * same address
 160  */
 161
 162 __attribute__ ((section(".init.0")))
 163 const void *const __interrupt_pad[0x10];
 164
 165 void main(void) __attribute__((__noreturn__));
 166
 167 void *__interrupt_ram[sizeof(__interrupt_vector)/sizeof(__interrupt_vector[0])] __attribute((section(".preserve.1")));
 168
 169 extern char __data_source[];
 170 extern char __data_start[];
 171 extern char __data_size[];
 172 extern char __bss_start[];
 173 extern char __bss_size[];
 174
 175 void _start(void) {
 176         memcpy(__data_start, __data_source, (uintptr_t) __data_size);
 177         memset(__bss_start, '\0', (uintptr_t) __bss_size);
 178
 179 #ifdef AO_BOOT_CHAIN
 180         if (ao_boot_check_chain()) {
 181 #ifdef AO_BOOT_PIN
 182                 if (ao_boot_check_pin())
 183 #endif
 184                 {
 185                         ao_boot_chain(AO_BOOT_APPLICATION_BASE);
 186                 }
 187         }
 188 #endif
 189 #if RELOCATE_INTERRUPT
 190         memcpy(__interrupt_ram, __interrupt_vector, sizeof(__interrupt_ram));
 191         lpc_scb.sysmemremap = LPC_SCB_SYSMEMREMAP_MAP_RAM << LPC_SCB_SYSMEMREMAP_MAP;
 192 #endif
 193         main();
 194 }