Explain diab 4.2b PowerPC family asm macros

[naseeam]

My Embedded Application runs on Motorola PowerPC MPC555 Microcontroller. The cross compiler is Diab 4.2b. Following is a macro for raising and restroing interrupts in MPC555.

asm unsigned int iplm_raise(void)
{
! "r3"

mfmsr r3
mtspr 81,r1
}

asm void iplm_restore(const unsigned int mask)
{
%reg mask ;
! "r12"

mfmsr r12
rlwimi r12,mask,0,16,16
mtmsr r12
}

The calls to these asm macros are as follows:

unsigned_32 mask;

RAISE_IPLM(mask) ;

/* critical section of code */

RESTORE_IPLM(mask) ;

Following are links:

1) Link to MPC555 Manual - pages of interest are 3-20 to 3-23
**broken link removed**

2) Link to MPC555 Instruction Set - Section 9 is of interest
**broken link removed**

3) I could not find a link to Diab 4.2b Target User's Manual for PowerPC Family. However, I have soft copy
of this manual. This manual explains asm macros. I'll tried attaching it but I get an error. I am asked to contact tech. support but they never responded me. Can someone help me attach this manual? Thanks.

Please explain above two macro in detail, line by line. Thanks.

 

[naseeam]

Diab Target User's Manual should be at www.windriver.com. Registration will be required in order to access the document.