Bug 423 - st*cx. needs to be able to update CR0
Summary: st*cx. needs to be able to update CR0
Alias: None
Product: Libre-SOC's first SoC
Classification: Unclassified
Component: Source Code (show other bugs)
Version: unspecified
Hardware: Other Linux
: --- enhancement
Assignee: Luke Kenneth Casson Leighton
Depends on:
Blocks: 383
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Reported: 2020-07-09 14:26 BST by Luke Kenneth Casson Leighton
Modified: 2020-07-09 14:26 BST (History)
1 user (show)

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Description Luke Kenneth Casson Leighton 2020-07-09 14:26:38 BST
microwatt writeback.vhdl

if l_in.rc = '1' then
                -- st*cx. instructions
                scf(3) := '0';
                scf(2) := '0';
                scf(1) := l_in.store_done;
                scf(0) := l_in.xerc.so;
                c_out.write_cr_enable <= '1';
                c_out.write_cr_mask <= num_to_fxm(0);
                c_out.write_cr_data(31 downto 28) <= scf;
            end if;

this has implications for LDST as it will need cr_a to be added to the output registers.  and xer.so to the input and output registers