MI_Swap*

Syntax

#include <nitro/mi.h>

u32 MI_SwapWord( u32 setData, volatile u32* destp );
u8 MI_SwapByte( u32 setData, volatile u8* destp );

Arguments

setData The data that is set
destp Pointer to the swap destination

Return Values

Value stored in the swap destination immediately prior to the swap.

Description

This function swaps setData and the data stored at *destp. This function implements spinlock to exclusively control resources that are shared between processors or modules. MI_SwapByte() swaps byte data. MI_SwapWord() swaps word data.

Note that byte access to the main memory is possible only via cache in the TEG environment. Therefore, MI_SwapWord() should be used for main memory.

Internal Operation

This swaps using the ARM instructions swp or swpb.

See Also

None.

Revision History

2004/10/18 Corrected the description of byte access.
2004/02/10 Initial version.

CONFIDENTIAL