static unsigned int config_word = DEFAULT_CONFIG_WORD;
static unsigned int config2_word = DEFAULT_CONFIG2_WORD;
+static memRange *rangeRAM = NULL;
extern int pic14_is_shared (regs *reg);
extern void emitSymbolToFile (FILE *of, const char *name, const char *section_type, int size, int addr, int useEQU, int globalize);
new_pic->dataMemSize = data;
new_pic->eepromMemSize = eeprom;
new_pic->ioPins = io;
+
+ new_pic->ram = rangeRAM;
Pics[num_of_supported_PICS] = new_pic;
num_of_supported_PICS++;
/* define ram areas - may be duplicated across banks */
static void ram_map(int num_words, char word[SPLIT_WORDS_MAX][PIC14_STRING_LEN])
{
- memRange r;
+ memRange *r;
if (num_words < 4) {
fprintf(stderr, "WARNING: not enough values in %s memmap directive\n", DEVICE_FILE_NAME);
return;
}
+
+ r = Safe_calloc(1, sizeof(memRange));
+ //fprintf (stderr, "%s: %s %s %s\n", __FUNCTION__, word[1], word[2], word[3]);
- r.start_address = parse_config_value(word[1]);
- r.end_address = parse_config_value(word[2]);
- r.alias = parse_config_value(word[3]);
- r.bank = (r.start_address >> 7) & 3;
+ r->start_address = parse_config_value(word[1]);
+ r->end_address = parse_config_value(word[2]);
+ r->alias = parse_config_value(word[3]);
+ r->bank = (r->start_address >> 7) & 3;
- addMemRange(&r, 0);
+ addMemRange(r, 0);
+
+ // add memRange to device entry for future lookup (sharebanks)
+ r->next = rangeRAM;
+ rangeRAM = r;
}
extern set *includeDirsSet;
{
int i;
int alias = r->alias;
+
+ //fprintf (stderr, "%s: range %x..%x, alias %x, bank %x\n", __FUNCTION__, r->start_address, r->end_address, r->alias, r->bank);
if (maxRAMaddress < 0) {
fprintf(stderr, "missing maxram setting in %s\n", DEVICE_FILE_NAME);
/*-----------------------------------------------------------------*
*
*-----------------------------------------------------------------*/
-void init_pic(char *pic_type)
+PIC_device *init_pic(char *pic_type)
{
char long_name[PIC14_STRING_LEN];
exit(1);
}
}
+ return pic;
}
/*-----------------------------------------------------------------*
}
/*-----------------------------------------------------------------*
- * Query the size of the sharebank of the selected device.
- * FIXME: Currently always returns 16.
+ * True iff the device has memory aliased in every bank.
+ * If true, low and high will be set to the low and high address
+ * occupied by the (last) sharebank found.
*-----------------------------------------------------------------*/
-int pic14_getSharebankSize(void)
+int pic14_hasSharebank(int *low, int *high, int *size)
{
- if (options.stack_size <= 0) {
- // default size: 16 bytes
- return 16;
- } else {
- return options.stack_size;
- }
+ memRange *r;
+
+ assert(pic);
+ r = pic->ram;
+
+ while (r) {
+ //fprintf (stderr, "%s: region %x..%x, bank %x, alias %x, pic->bankmask %x\n", __FUNCTION__, r->start_address, r->end_address, r->bank, r->alias, pic->bankMask);
+ if (r->alias == pic->bankMask) {
+ if (low) *low = r->start_address;
+ if (high) *high = r->end_address;
+ if (size) *size = r->end_address - r->start_address + 1;
+ return 1;
+ } // if
+ r = r->next;
+ } // while
+
+ if (low) *low = 0x0;
+ if (high) *high = 0x0;
+ if (size) *size = 0x0;
+ //fprintf (stderr, "%s: no shared bank found\n", __FUNCTION__);
+ return 0;
}
-/*-----------------------------------------------------------------*
- * Query the highest byte address occupied by the sharebank of the
- * selected device.
- * THINK: Might not be needed, if we assign all shareable objects to
- * a `udata_shr' section and let the linker do the rest...
- * Tried it, but yields `no target memory available' for pic16f877...
- *-----------------------------------------------------------------*/
-int pic14_getSharebankAddress(void)
+/*
+ * True iff the memory region [low, high] is aliased in all banks.
+ */
+int pic14_isShared(int low, int high)
{
- int sharebankAddress = 0x7f;
- if (options.stack_loc != 0) {
- // permanent (?) workaround for pic16f84a-like devices with hardly
- // any memory:
- // 0x00-0x0B SFR
- // 0x0C-0x4F memory,
- // 0x50-0x7F unimplemented (reads as 0),
- // 0x80-0x8B SFRs (partly mapped to 0x0?)
- // 0x8c-0xCF mapped to 0x0C-0x4F
- sharebankAddress = options.stack_loc + pic14_getSharebankSize() - 1;
- } else {
- /* If total RAM is less than 0x7f as with 16f84 then reduce
- * sharebankAddress to fit */
- if ((unsigned)sharebankAddress > pic14_getMaxRam())
- sharebankAddress = (int)pic14_getMaxRam();
- }
- return sharebankAddress;
+ memRange *r;
+
+ assert(pic);
+ r = pic->ram;
+
+ while (r) {
+ //fprintf (stderr, "%s: region %x..%x, bank %x, alias %x, pic->bankmask %x\n", __FUNCTION__, r->start_address, r->end_address, r->bank, r->alias, pic->bankMask);
+ if ((r->alias == pic->bankMask) && (r->start_address <= low) && (r->end_address >= high)) {
+ return 1;
+ } // if
+ r = r->next;
+ } // while
+
+ return 0;
+}
+
+/*
+ * True iff all RAM is aliased in all banks (no BANKSELs required except for
+ * SFRs).
+ */
+int pic14_allRAMShared(void)
+{
+ memRange *r;
+
+ assert(pic);
+ r = pic->ram;
+
+ while (r) {
+ if (r->alias != pic->bankMask) return 0;
+ r = r->next;
+ } // while
+
+ return 1;
+}
+
+/*
+ * True iff the pseudo stack is a sharebank --> let linker place it.
+ * [low, high] denotes a size byte long block of (shared or banked)
+ * memory to be used.
+ */
+int pic14_getSharedStack(int *low, int *high, int *size)
+{
+ int haveShared;
+ int l, h, s;
+
+ haveShared = pic14_hasSharebank(&l, &h, &s);
+ if ((options.stack_loc != 0) || !haveShared)
+ {
+ // sharebank not available or not to be used
+ s = options.stack_size ? options.stack_size : 0x10;
+ l = options.stack_loc ? options.stack_loc : 0x20;
+ h = (options.stack_loc ? options.stack_loc : 0x20) + s - 1;
+ if (low) *low = l;
+ if (high) *high = h;
+ if (size) *size = s;
+ // return 1 iff [low, high] is present in all banks
+ //fprintf(stderr, "%s: low %x, high %x, size %x, shared %d\n", __FUNCTION__, l, h, s, pic14_isShared(l, h));
+ return (pic14_isShared(l, h));
+ } else {
+ // sharebanks available for use by the stack
+ if (options.stack_size) s = options.stack_size;
+ else if (!s || s > 16) s = 16; // limit stack to 16 bytes in SHAREBANK
+
+ // provide addresses for sharebank
+ if (low) *low = l;
+ if (high) *high = l + s - 1;
+ if (size) *size = s;
+ //fprintf(stderr, "%s: low %x, high %x, size %x, shared 1\n", __FUNCTION__, l, h, s);
+ return 1;
+ }
}
PIC_device * pic14_getPIC(void)
projects / fw / sdcc / blobdiff