Interrupts, Memory maps – Comtrol eCos User Manual
Page 250
Chapter 5. Installation and Testing
void Linux(int argc, char **argv, char **envp);
RedBoot will place the appropriate data at the offset specified by the
-b
parameter, or by default at address
0x80080000, and will set the arguments accordingly when calling into the kernel.
The default entry point, if no image with explicit entry point has been loaded and none is specified, is 0x80000750.
Interrupts
RedBoot uses an interrupt vector table which is located at address 0x80000400. Entries in this table are pointers to
functions with this protoype:
int irq_handler( unsigned vector, unsigned data )
On
an
atlas
board,
the
vector
argument
is
one
of
25
interrupts
defined
in
hal/mips/atlas/VERSION /include/plf_intr.h
:
#define CYGNUM_HAL_INTERRUPT_SER
0
#define CYGNUM_HAL_INTERRUPT_TIM0
1
#define CYGNUM_HAL_INTERRUPT_2
2
#define CYGNUM_HAL_INTERRUPT_3
3
#define CYGNUM_HAL_INTERRUPT_RTC
4
#define CYGNUM_HAL_INTERRUPT_COREHI
5
#define CYGNUM_HAL_INTERRUPT_CORELO
6
#define CYGNUM_HAL_INTERRUPT_7
7
#define CYGNUM_HAL_INTERRUPT_PCIA
8
#define CYGNUM_HAL_INTERRUPT_PCIB
9
#define CYGNUM_HAL_INTERRUPT_PCIC
10
#define CYGNUM_HAL_INTERRUPT_PCID
11
#define CYGNUM_HAL_INTERRUPT_ENUM
12
#define CYGNUM_HAL_INTERRUPT_DEG
13
#define CYGNUM_HAL_INTERRUPT_ATXFAIL
14
#define CYGNUM_HAL_INTERRUPT_INTA
15
#define CYGNUM_HAL_INTERRUPT_INTB
16
#define CYGNUM_HAL_INTERRUPT_INTC
17
#define CYGNUM_HAL_INTERRUPT_INTD
18
#define CYGNUM_HAL_INTERRUPT_SERR
19
#define CYGNUM_HAL_INTERRUPT_HW1
20
#define CYGNUM_HAL_INTERRUPT_HW2
21
#define CYGNUM_HAL_INTERRUPT_HW3
22
#define CYGNUM_HAL_INTERRUPT_HW4
23
#define CYGNUM_HAL_INTERRUPT_HW5
24
The data passed to the ISR is pulled from a data table (
hal_interrupt_data
) which immediately follows the
interrupt vector table. With 25 interrupts, the data table starts at address 0x80000464 on atlas.
An application may create a normal C function with the above prototype to be an ISR. Just poke its address into the
table at the correct index and enable the interrupt at its source. The return value of the ISR is ignored by RedBoot.
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