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#include "port_spr_defs.h"
        
        .file           "portasm.S"
        .section        .text

.macro portSAVE_CONTEXT
        .global pxCurrentTCB                    
        # make rooms in stack                   
        l.addi  r1, r1, -132                    
        # early save r3-r5, these are clobber register
        l.sw    0x08(r1), r3                    
        l.sw    0x0C(r1), r4                    
        l.sw    0x10(r1), r5                    
        # save SPR_ESR_BASE(0), SPR_EPCR_BASE(0)
        l.mfspr r3, r0, SPR_ESR_BASE    
        l.mfspr r4, r0, SPR_EPCR_BASE   
        l.sw    0x78(r1), r3                    
        l.sw    0x7C(r1), r4                    
        l.sw    0x00(r1), r9                    
        # Save Context                                  
        l.sw    0x04(r1), r2                    
        l.sw    0x14(r1), r6                    
        l.sw    0x18(r1), r7                    
        l.sw    0x1C(r1), r8                    
        l.sw    0x20(r1), r10                   
        l.sw    0x24(r1), r11                   
        l.sw    0x28(r1), r12                   
        l.sw    0x2C(r1), r13                   
        l.sw    0x30(r1), r14                   
        l.sw    0x34(r1), r15                   
        l.sw    0x38(r1), r16                   
        l.sw    0x3C(r1), r17                   
        l.sw    0x40(r1), r18                   
        l.sw    0x44(r1), r19                   
        l.sw    0x48(r1), r20                   
        l.sw    0x4C(r1), r21                   
        l.sw    0x50(r1), r22                   
        l.sw    0x54(r1), r23                   
        l.sw    0x58(r1), r24                   
        l.sw    0x5C(r1), r25                   
        l.sw    0x60(r1), r26                   
        l.sw    0x64(r1), r27                   
        l.sw    0x68(r1), r28                   
        l.sw    0x6C(r1), r29                   
        l.sw    0x70(r1), r30                   
        l.sw    0x74(r1), r31                   
        # Save the top of stack in TCB  
        l.movhi r3, hi(pxCurrentTCB)    
        l.ori   r3, r3, lo(pxCurrentTCB)
        l.lwz   r3, 0x0(r3)                             
        l.sw    0x0(r3), r1                             
        # restore clobber register              
        l.lwz   r3, 0x08(r1)                    
        l.lwz   r4, 0x0C(r1)                    
        l.lwz   r5, 0x10(r1)            
.endm


.macro portRESTORE_CONTEXT
        l.movhi r3, hi(pxCurrentTCB)    
        l.ori   r3, r3, lo(pxCurrentTCB)
        l.lwz   r3, 0x0(r3)                             
        l.lwz   r1, 0x0(r3)                             
        # restore context                               
        l.lwz   r9, 0x00(r1)                    
        l.lwz   r2, 0x04(r1)                    
        l.lwz   r6, 0x14(r1)                    
        l.lwz   r7, 0x18(r1)                    
        l.lwz   r8, 0x1C(r1)                    
        l.lwz   r10, 0x20(r1)                   
        l.lwz   r11, 0x24(r1)                   
        l.lwz   r12, 0x28(r1)                   
        l.lwz   r13, 0x2C(r1)                   
        l.lwz   r14, 0x30(r1)                   
        l.lwz   r15, 0x34(r1)                   
        l.lwz   r16, 0x38(r1)                   
        l.lwz   r17, 0x3C(r1)                   
        l.lwz   r18, 0x40(r1)                   
        l.lwz   r19, 0x44(r1)                   
        l.lwz   r20, 0x48(r1)                   
        l.lwz   r21, 0x4C(r1)                   
        l.lwz   r22, 0x50(r1)                   
        l.lwz   r23, 0x54(r1)                   
        l.lwz   r24, 0x58(r1)                   
        l.lwz   r25, 0x5C(r1)                   
        l.lwz   r26, 0x60(r1)                   
        l.lwz   r27, 0x64(r1)                   
        l.lwz   r28, 0x68(r1)                   
        l.lwz   r29, 0x6C(r1)                   
        l.lwz   r30, 0x70(r1)                   
        l.lwz   r31, 0x74(r1)                   
        # restore SPR_ESR_BASE(0), SPR_EPCR_BASE(0)
        l.lwz   r3, 0x78(r1)                    
        l.lwz   r4, 0x7C(r1)                    
        l.mtspr r0, r3, SPR_ESR_BASE    
        l.mtspr r0, r4, SPR_EPCR_BASE   
        # restore clobber register              
        l.lwz   r3, 0x08(r1)                    
        l.lwz   r4, 0x0C(r1)                    
        l.lwz   r5, 0x10(r1)                    
        l.addi  r1, r1, 132                     
        l.rfe                                                   
        l.nop                                                   
.endm


.text
.global vPortTickHandler
.type   vPortTickHandler, %function
vPortTickHandler:
        portSAVE_CONTEXT        
                
        l.mfspr r3, r0, SPR_TTMR
        l.movhi r4, hi(SPR_TTMR_IP)     
        l.ori   r4, r4, lo(SPR_TTMR_IP)
        l.xori  r4, r4, 0xffffffff
        l.and   r3, r3, r4                              # clear tick timer interrupt
        l.mtspr r0, r3, SPR_TTMR

        l.jal   vTaskIncrementTick
        l.nop
.if configUSE_PREEMPTION == 0
        # do nothing
.else
        l.jal   vTaskSwitchContext
        l.nop
.endif

        portRESTORE_CONTEXT
.size   vPortTickHandler, .-vPortTickHandler


.text
.global vPortSystemCall
.type   vPortSystemCall, %function
vPortSystemCall:
        portSAVE_CONTEXT        
        
        l.jal   vTaskSwitchContext
        l.nop
        
        portRESTORE_CONTEXT
.size   vPortSystemCall, .-vPortSystemCall


.text
.global vPortExtIntHandler
.type   vPortExtIntHandler, %function
vPortExtIntHandler:
        portSAVE_CONTEXT        

    l.jal       int_main
        l.nop

.if configUSE_PREEMPTION == 0
        # do nothing
.else
        l.jal   vTaskSwitchContext
        l.nop
.endif
        
        portRESTORE_CONTEXT
.size   vPortExtIntHandler, .-vPortExtIntHandler


.text
.global vPortMiscIntHandler
.type   vPortMiscIntHandler, %function
vPortMiscIntHandler:
        portSAVE_CONTEXT        

    l.jal       misc_int_handler
        l.lwz   r3, -4(r1)

.if configUSE_PREEMPTION == 0
        # do nothing
.else
        l.jal   vTaskSwitchContext
        l.nop
.endif
        
        portRESTORE_CONTEXT
.size   vPortMiscIntHandler, .-vPortMiscIntHandler