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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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#include <arch/asm/macro.h>
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#include <arch/asm/macro.h>
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#include <arch/asm/spr.h>
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.section K_TEXT_START
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.section K_TEXT_START
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.global kernel_image_start
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.global kernel_image_start
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.org 0x0
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/* 256 bytes of some data */
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/* exception table - must use 'ba' instructions for branches,
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 * because it is elsewhere than the linker thinks
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 */
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.space 4096
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kernel_image_start:
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kernel_image_start:
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	/* Initialize OFW, might be needed before relocate_kernel? */
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	lis r4, ofw@ha
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	lis r4, ofw@ha
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	addi r4, r4, ofw@l
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	addi r4, r4, ofw@l
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	stw r5, 0(r4)
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	stw r5, 0(r4)
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	bl ofw_init
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	bl ofw_init
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	bl preboot_read_config
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	bl relocate_kernel
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__after_reloc:
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	/* Set stack to some more meaningful value */
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	/* TODO: This is hardcoded for PearPC, must be changed later */
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	lis r1, 0x70
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	b main_bsp
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	b main_bsp
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relocate_kernel:
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	/* TODO: We _know_ that pearpc loads it to 8MB, and
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	 * but it should be really generic
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	 */
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	lis r4, 0x80 /* r4 is where data was loaded - 8MB */
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	bl to_real_mode
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	/* Now we are in real mode, copy first block and jump to it,
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	 * we are running in the loaded kernel now
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	 * We still have in r3 physical load kernel address
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	 */
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	b __after_reloc /* We know in pearpc we are ok, so return,
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	                 * otherwise we should relocate kernel
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		         * here
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	                 */
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/* Turn off page translation
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 * - assume that physical-loaded address is in r4
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 */
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to_real_mode:
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	mflr r0
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	lis   r5, ktext_start@ha // Expected start of kernel
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	addi r5, r5, ktext_start@l
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	add  r0, r4, r0
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	sub  r0, r0, r5         // r0 now contains physical return address
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	mfmsr r3
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	andis. r3, r3, (~MSR_DR | MSR_IR) >> 16
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	mtspr SPRN_SRR0, r0
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	mtspr SPRN_SRR1, r3
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	sync 			// Really needed? RFI should do it as well?
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	RFI
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