nes-proj/cpu/x86/quarkX1000.ld
Michael LeMay c815fa4511 x86: Use shared ISR for I2C and GPIO
This patch permits interrupts to be generated by both the I2C and GPIO
controllers for simultaneously-executing applications. The controllers
share a single interrupt pin, INTC. Prior to this patch,
quarkX1000_gpio_init() routed INTA to PIRQC and IRQ 10 (due to an
incorrect assumption that INTA is connected to the GPIO controller),
and quarkX1000_i2c_init() routed INTC to PIRQC and IRQ 9. The I2C
controller initialization is a prerequisite for GPIO initialization,
so the final configuration was that INTA and INTC were both routed to
PIRQC and IRQ 10. Thus, only the GPIO ISR was being invoked, even if
the I2C controller was actually responsible for the interrupt.

This patch refactors the I2C and GPIO ISR setup and handler code so
that the shared portions are combined in
cpu/x86/drivers/legacy_pc/shared-isr.[ch].  The I2C and GPIO drivers
communicate their interrupt information to the shared component by
placing structures in a specific section of the binary.
2016-02-16 21:19:44 -08:00

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/*
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
OUTPUT_FORMAT("elf32-i386")
ENTRY(start)
SECTIONS {
/*
OS-Dev Wiki says it is common for kernels to start at 1M. Addresses before that
are used by BIOS/EFI, the bootloader and memory-mapped I/O.
The UEFI GenFw program inserts a 0x240-byte offset between the image base and
the .text section. We add that same offset here to align the symbols in the
UEFI DLL with those in the final UEFI binary to make debugging easier. We also
apply 32-byte alignments to sections rather than more conventional 4K-byte
alignments to avoid symbols being shifted from the intermediate DLL to the
final UEFI image as would occur if the GenFw program shifted the .text section
from a higher, 4K-aligned offset to the 0x240-byte offset from the image base.
Such shifting may make debugging more difficult by preventing the DLL from
being a directly-useful source of symbol information. The debugging symbols
are not included in the final UEFI image. The GenFw program uses a minimum
section alignment of 32 bytes, so smaller alignment granularities may also
result in symbol perturbation.
*/
. = 1M + 0x240;
.text ALIGN (32) :
{
KEEP(*(.multiboot))
*(.text*)
}
.rodata ALIGN (32) :
{
*(.rodata*)
_sdata_shared_isr = .;
KEEP(*(.shared_isr_data*))
_edata_shared_isr = .;
}
.data ALIGN (32) :
{
*(.data*)
}
.bss ALIGN (32) :
{
*(COMMON)
*(.bss*)
}
}