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armcm_boot: Add generic code for early board init on armcm machines

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Add basic ARM Cortex-M C init code and build linker scripts to
src/generic/ code.  This can be used to simplify the various ARM board
code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-08-21 12:05:56 -04:00
parent 351910c5ac
commit 2a2cf1f536
5 changed files with 202 additions and 0 deletions
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44
scripts/buildcommands.py
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@ -209,6 +209,50 @@ const int initial_pins_size PROGMEM = ARRAY_SIZE(initial_pins);
Handlers.append(HandleInitialPins())
######################################################################
# ARM IRQ vector table generation
######################################################################
# Create ARM IRQ vector table from interrupt handler declarations
class Handle_arm_irq:
def __init__(self):
self.irqs = {}
self.ctr_dispatch = { 'DECL_ARMCM_IRQ': self.decl_armcm_irq }
def decl_armcm_irq(self, req):
func, num = req.split()[1:]
num = decode_integer(num)
if num in self.irqs and self.irqs[num] != func:
error("Conflicting IRQ definition %d (old %s new %s)"
% (num, self.irqs[num], func))
self.irqs[num] = func
def update_data_dictionary(self, data):
pass
def generate_code(self, options):
armcm_offset = 16
if 1 - armcm_offset not in self.irqs:
# The ResetHandler was not defined - don't build VectorTable
return ""
max_irq = max(self.irqs.keys())
table = [" DefaultHandler,\n"] * (max_irq + armcm_offset + 1)
defs = []
for num, func in self.irqs.items():
if num < 1 - armcm_offset:
error("Invalid IRQ %d (%s)" % (num, func))
defs.append("extern void %s(void);\n" % (func,))
table[num + armcm_offset] = " %s,\n" % (func,)
table[0] = " &_stack_end,\n"
fmt = """
extern void DefaultHandler(void);
extern uint32_t _stack_end;
%s
const void *VectorTable[] __visible __section(".vector_table") = {
%s};
"""
return fmt % (''.join(defs), ''.join(table))
Handlers.append(Handle_arm_irq())
######################################################################
# Wire protocol commands and responses
######################################################################