diff options
Diffstat (limited to 'cpu/instructions/parameter.txt')
| -rw-r--r-- | cpu/instructions/parameter.txt | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/cpu/instructions/parameter.txt b/cpu/instructions/parameter.txt index 47cf30a..311c00a 100644 --- a/cpu/instructions/parameter.txt +++ b/cpu/instructions/parameter.txt @@ -1,6 +1,6 @@ -n: min number of bits to be able to represent all types +n: min number of bits to be able to represent all parameter types y: min size required to represent each power of two value less than or equal to the current mode (in bytes, and greater than or equal to 1) -x: y + [min size to represent each valid offset into the immediate value array] +x: n + y + max([min size to represent each valid offset into the immediate value array], [min size to represent all registers]) Binary format: type[n], data[x] @@ -11,20 +11,26 @@ Types: Value is placed directly in the data section Immediate reference: - data[0 to x-y-1]: + data[n to x-y-1]: size of immediate value data[x-y to x-1]: byte offset into the array of immediate values Register: - data just to select which register + data[n to x-y-1]: + how much of the register to use + + data[x-y to x-1]: + which register to use Memory at immediate reference: Uses RAM pointed to by the value as obtained in `immediate reference` above + Size is specified by data[0 to n-1] Memory at register: Uses RAM pointed to by the value as obtained in `register` above + Size is specified by data[0 to n-1] TODO: Will add more later |