The purpose of the Global History Buffer (GHB) array operation is to:

The GHB array operation is accessible in privileged modes only.

Figure 3.79 shows the bit arrangement of the GHB array read operation.

Figure 3.80 shows the bit arrangement of the GHB array write operation.

To write one entry in the instruction side GHB array, for example:

LDR R0, =0x3333AAAA;            

MCR p15, 0, R0, c15, c1, 0;     Move R0 to I-L1 data 0 Register

LDR R1, =0x0000020C;            

MCR p15, 0, R1, c15, c5, 2;     Write I-L1 data 0 Register to GHB

To read one entry in the instruction side GHB array, for example:

LDR R1, =0x0000020C;            

MCR p15, 0, R1, c15, c7, 2;     Read GHB into I-L1 data 0 Register

MRC p15, 0, R0, c15, c1, 0;     Move I-L1 data 0 Register to R0