| // xea1/intlevel-set.S - Interrupt related assembler code - _xtos_set_intlevel |
| |
| // Copyright (c) 2004-2016 Tensilica Inc. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining |
| // a copy of this software and associated documentation files (the |
| // "Software"), to deal in the Software without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Software, and to |
| // permit persons to whom the Software is furnished to do so, subject to |
| // the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| |
| #include <xtensa/coreasm.h> |
| #include <xtensa/config/specreg.h> |
| #include "../xtos-internal.h" |
| |
| #if XCHAL_HAVE_XEA1 |
| |
| |
| /*************************************************************************** |
| * unsigned _xtos_set_intlevel(int intlevel); |
| * |
| * _xtos_set_intlevel() is used to set the current priority from C code; |
| * it can be called from the application or from a C interrupt handler. |
| * |
| * NOTE: This version allows the 'intlevel' parameter to be computed |
| * at run-time, and thus is longer. It is much more efficient, and |
| * highly recommented, to use the XTOS_SET_INTLEVEL(intlevel) macro instead |
| * (which requires a constant intlevel). |
| */ |
| |
| .text |
| .align 4 |
| .global _xtos_set_intlevel |
| .type _xtos_set_intlevel,@function |
| _xtos_set_intlevel: |
| abi_entry |
| #if XCHAL_HAVE_INTERRUPTS |
| /* In XEA1, we have to rely on INTENABLE register virtualization: */ |
| movi a4, Xthal_intlevel_andbelow_mask |
| extui a3, a2, 0, 4 // keep only INTLEVEL bits of parameter |
| addx4 a5, a3, a4 // index mask to use |
| l32i a3, a5, 0 // get mask of interrupts at requested intlevel and below |
| movi a5, -1 // all 1's |
| xtos_addr_percore a4, xtos_intstruct |
| xor a3, a3, a5 // mask of interrupts at intlevels above the requested one (to enable) |
| xtos_lock a7 // MUST USE highest address register of function to avoid window overflows in critical section |
| l32i a2, a4, XTOS_VPRI_ENABLED_OFS // return old xtos_vpri_enabled (current vpri) |
| l32i a5, a4, XTOS_ENABLED_OFS // a5 = xtos_enabled |
| s32i a3, a4, XTOS_VPRI_ENABLED_OFS // set new xtos_vpri_enabled (current vpri) |
| and a5, a5, a3 // a5 = xtos_enabled & xtos_vpri_enabled |
| wsr.intenable a5 |
| xtos_unlock a7 |
| #endif /*XCHAL_HAVE_INTERRUPTS*/ |
| abi_return |
| |
| .size _xtos_set_intlevel, . - _xtos_set_intlevel |
| |
| #endif /* XEA1 */ |
| |
