1 // ints-on.S - Interrupt related assembler code - _xtos_ints_on
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24 #include <xtensa/coreasm.h>
25 #include <xtensa/config/specreg.h>
26 #include "xtos-internal.h"
29 /***************************************************************************
30 * _xtos_ints_on() and _xtos_ints_off() are used
31 * to enable and disable interrupts from C code;
32 * they can be called from the application or from a C interrupt handler.
36 // u32 _xtos_ints_on( u32 mask );
37 // Enables a set of interrupts.
38 // With INTENABLE virtualizing, does not simply set INTENABLE directly, but rather
39 // computes it as a function of the current virtual priority.
41 // MUST NOT be called when PS.INTLEVEL > XTOS_LOCKLEVEL
42 // (otherwise PS.INTLEVEL gets lowered; and operation may be inconsistent
43 // if this is called in the handler of an interrupt of level > LOCKLEVEL).
48 .type _xtos_ints_on,@function
51 #if XCHAL_HAVE_INTERRUPTS
52 # if XTOS_VIRTUAL_INTENABLE
53 movi a4, _xtos_intstruct
54 xtos_lock a7 // MUST USE highest address register of function to avoid window overflows in critical section
55 l32i a3, a4, XTOS_ENABLED_OFS // a3 = xtos_enabled
56 l32i a6, a4, XTOS_VPRI_ENABLED_OFS // a6 = xtos_vpri_enabled
57 or a5, a3, a2 // xtos_enabled | mask
58 s32i a5, a4, XTOS_ENABLED_OFS // xtos_enabled |= mask
59 and a5, a5, a6 // a5 = xtos_enabled & xtos_vpri_enabled
61 xtos_lock a7 // MUST USE highest address register of function to avoid window overflows in critical section
64 or a5, a3, a2 // INTENABLE | mask
68 mov a2, a3 // return previous (virtual or real) INTENABLE value
69 #else /*XCHAL_HAVE_INTERRUPTS*/
70 movi a2, 0 // this config does not have interrupts, so return 0
71 #endif /*XCHAL_HAVE_INTERRUPTS*/
74 .size _xtos_ints_on, . - _xtos_ints_on