URL https://opencores.org/ocsvn/neorv32/neorv32/trunk

Subversion Repositories neorv32

[/] [neorv32/] [trunk/] [sw/] [lib/] [source/] [neorv32_cpu.c] - Diff between revs 16 and 18

Rev 16	Rev 18
Line 240...	Line 240...

`/********************************************************************//`	`/********************************************************************//`
`* Switch from privilege mode MACHINE to privilege mode USER.`	`* Switch from privilege mode MACHINE to privilege mode USER.`
`*`	`*`
`* @note This function requires the U extension to be implemented.`	`* @note This function requires the U extension to be implemented.`
`* @note Maybe you should do a fencei after this.`	`* @note Maybe you should do a fence.i after this.`
`**************************************************************************/`	`**************************************************************************/`
`void __attribute__((naked)) neorv32_cpu_goto_user_mode(void) {`	`void __attribute__((naked)) neorv32_cpu_goto_user_mode(void) {`

`register uint32_t mask = (1<<CPU_MSTATUS_MPP_H) \| (1<<CPU_MSTATUS_MPP_L);`	`register uint32_t mask = (1<<CPU_MSTATUS_MPP_H) \| (1<<CPU_MSTATUS_MPP_L);`
`mask = ~mask;`
`asm volatile ("csrrc zero, mstatus, %[input_j]" : : [input_j] "r" (mask));`	`asm volatile ("csrrc zero, mstatus, %[input_j]" : : [input_j] "r" (mask));`

`// return and switch to user mode`	`// return switching to user mode`
`asm volatile ("csrw mepc, ra");`	`asm volatile ("csrw mepc, ra");`
`asm volatile ("mret");`	`asm volatile ("mret");`
`}`	`}`


`No newline at end of file`	`No newline at end of file`